Simple .NET Tips.

Load balancing

2010-12-16T20:29:00.000+06:00

From past few days I was spending time on network load balancing for web servers and found some basic concept about it.

First come what is load balancing (in a non-bookish manner J ). Well load balancing is some sort of technology where multiple systems are used to reduce the load of a single system.

Suppose a server serves per request within 20ms for 10 users for a certain web application but somehow that application get popular with in few days and user get increased 10 to 10,000!! Do you still believe that server with same configuration and same application can serves per request within 20ms? Umm …. I’m sure your answer is now. So people resolve these things? Well there are many solutions, among them network load balancing is a common solution.

The main reasons of load balancing are minimize response time, maximize user of resource utilization, maximize throughput and so on.

Load balancing solutions : Nowadays load balancing is perform through different type of technologies such as hardware load balancing device , load balancing software , gateway with built in load balancing features, Round robin DNS etc.

Persistence problem: Better to mention it “sticky session” problem. Suppose we are using two web servers (Server A and Server B) which are load balanced now a user login into a web application which runs on Server A and stars purchasing items suddenly load balances device identified that the load is full for Server A and auto failover to Server B, in this condition the session state is going to be lost as the session state was hold by the Server A. Isn’t it a crap! Of course it is. This issue can be resolved by storing the session data in client side through cookie but for security reason it’s not possible to for highly secured site, another solution is storing session data in database though it creates performance issue but increase the scalability.

Most of the hardware load balancer work at Transport layer (OSI layer 4) and Application layer (OSI layer 7). Intelligent load balancer checks the server’s health through communication with server and distribute load as per need, it also manages sticky session problem and distribute the load accordingly so that users can there sessions at same server.

That’s all for now .

Bye

Observer Pattern - implementation and application with C#.NET

2010-09-07T15:17:00.000+06:00

Hello All

Today I will go through with “Observer Patter”, where I will try to explain a simple example of this pattern as well as implementation and use.

First come to what is Observer Patter, as per Wikipedia the general definition of Observer pattern is as bellow:

“The observer pattern (a subset of the publish/subscribe pattern) is a software design pattern in which an object, called the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods. It is mainly used to implement distributed event handling systems.”

The UML diagram of basic observer pattern is as bellow:

How actually this pattern works?

Well as per the above definition we have 2 types of objects one is Subject and other one is Observer. A Subject maintain a list of Observe objects and notify those when property of subject changes.

Example:

Suppose we are maintaining stock exchanges data and we have number of securities agencies. Those securities consume our stock’s data as per there need. When they what to consume data, they register in our system and unsubscribe when they are needed. Here the catch is, they are always updated for each stock’s data change.

In the following C# code example I will try to pull out the gist of Observer pattern as per our above description.

In the code example I have taken 2 interfaces and 3 concrete classes of which 1 interface and 2 concrete classes are of Observer’s & 1 interface and 1 concrete class of Subject’s.

IObserver Interface:

This interface contains 2 method signatures. One is Update and another is ShowData.

using System.Collections.Generic;

namespace ObserverPatter
{
    interface IObserver
    {
         void Update(Dictionary<string, float> stocks);

         void ShowData();
    }
}

FirstObserver concrete class:

This class implements the IObserver interface. The Update method changes the property of stocks information with the new stocks information and ShowData makes the new stock information visible.

using System;
using System.Collections.Generic;

namespace ObserverPatter
{
    class FirstObserver : IObserver
    {
        private Dictionary<string, float> _stocks;

        public void Update(Dictionary<string, float> newData)
        {
            this._stocks = newData;

            this.ShowData();
        }


        public void ShowData()
        {
            Console.WriteLine("First Securities LTD");
           foreach( KeyValuePair<string,float> data in _stocks)
           {
            Console.WriteLine("Current price of {0} is now {1}",data.Key,data.Value);
           }
        }
    }
}

SecondObserver concrete class:

This class is also act as previous one. We are taking this class just to show as second observer which will be a subscriber of the server and will be unsubscribe latter.

using System;
using System.Collections.Generic;

namespace ObserverPatter
{
    class SecondObserver : IObserver
    {
        private Dictionary<string, float> _stocks;

        public void Update(Dictionary<string, float> newData)
        {
            this._stocks = newData;
            this.ShowData();
        }


        public void ShowData()
        {
            Console.WriteLine("Second Securities LTD");
            foreach (KeyValuePair<string, float> data in _stocks)
            {
                Console.WriteLine("Current price of {0} is now {1}", data.Key, data.Value);
            }
        }
    }
}

ISubject Interface:

This interface contains 3 main method's signature 1.RegisterObserver 2.RemoveObserver 3.NotifyObservers

RegisterObserver method register an observe in subject’s observer list.

RemoveObserver method unregister an observer from the subject’s observer list.

NotifyObservers method is responsible to notify all objects which are subscribed to the server .


namespace ObserverPatter
{
    interface ISubject
    {
         void RegisterObserver(IObserver o);
         void RemoveObserver(IObserver o);
         void NotifyObservers();

    }
}

StockSubject concrete class:

We have implemented ISubject interface in this class and proceeded accordingly.

using System.Collections.Generic;

namespace ObserverPatter
{
    class StockSubject : ISubject
    {
        private List<IObserver> _observers = new List<IObserver>();
        private Dictionary<string, float> _stocks;

        public void RegisterObserver(IObserver o)
        {
            _observers.Add(o);
        }

        public void RemoveObserver(IObserver o)
        {
            _observers.Remove(o);
        }

        public void NotifyObservers()
        {
            foreach(IObserver observer in _observers)
            {
                observer.Update(_stocks);
            }
        }

        public void setStockPriceInformation(Dictionary<string,float> newData)
        {
            this._stocks = newData;
            this.NotifyObservers();
        }

    }
}

Now in the runner class “Program” we have implemented our application where we have added two observers and letter removed one observer at runtime.

using System;
using System.Collections.Generic;

namespace ObserverPatter
{
    class Program
    {
        static void Main(string[] args)
        {

            StockSubject stockSubject = new StockSubject();

            var firstObserver = new FirstObserver();
            var secondObserver = new SecondObserver();

            stockSubject.RegisterObserver(firstObserver);
            stockSubject.RegisterObserver(secondObserver);


            var dataSet = new Dictionary<string,float>();
            dataSet.Add("Google Inc", 500.25f);
            dataSet.Add("Micorsoft",400.15f);

            stockSubject.setStockPriceInformation(dataSet);

            dataSet.Clear();
            dataSet.Add("Google Inc", 330.25f);
            dataSet.Add("Micorsoft", 550.15f);

            stockSubject.RemoveObserver(secondObserver);

            stockSubject.setStockPriceInformation(dataSet);

            Console.ReadKey();
        }
    }
}

Output :

Ok that’s it for today . Let me know if you have any concern regarding this pattern or code.

Take care

Bye

Git in Windows with TortoiseGIT client & ProjectLocker free Git Hosting

2010-06-06T12:57:00.000+06:00

Hello All

Hope you all are fine. Today I will show how to work with Git in windows environment with TortoiseGIT client & ProjectLocker Git Hosting. ProjectLocker is a good Git hosting provider for startup a private project, you may check there pricing plan to let know more about the features of different plan.

Now first do signup from https://www.projectlocker.com/signup/startup ( I will show through a free plan) , After signing up verify your account and login through https://portal.projectlocker.com/ . You will find “Account Links > Add Project” from the left menu panel, select “Add Project”. Now give a project name, description and select Git as Repository type.I’m giving the name “DemoGit” for my project.Click “Create Project”.

In the next step you have to create user account from “Account Links > Add User”. Now you have to create a Public Key for your repository.

First download PuttyGen from the [ link ] or anywhere you found through googling and create a public and private key pair through the software as bellow by clicking Generate button and moving mouse pointer arbitrary.

Now give a passphrase and confirm it.After that save the private key by clicking “Save private key” , I have saved my with the name demokey.ppk . You have to copy the public key (the top red marked block in the following pictuer)

Its time to get back in ProjectLocker :) . Click manage public key from “User Links > Manage Public Keys” and click “New Key”. Then pest the public key in Key section ,User name (which you have created in user section, I’m putting my email here) and a name to identify the key in Name section and save it as bellow by clicking “Save Public Key”:

Open list projects from “Account Links > List Projects” and select your desired project from the Name column (I’m selecting DemoGit for the demonstration purpose.) as bellow:

Now assign the user to the project from the user list bellow by clicking “Add To Project” corresponding user.

It’s the time to play with Git client software. For this, first we have to install msysgit from http://code.google.com/p/msysgit/downloads/list after that TortoisGIT from http://code.google.com/p/tortoisegit/downloads/list accordingly with next,next flow (I mean default settings, you don’t have to change any settings over there ) and reboot your machine.

Now open a folder where you want to put your files to sink with Git repository (I’m opening a folder named “DemoGit”). After that right click on the the folder and click “Gil Clone..” as bellow:

Now in the next panel you have to pest the Url (git repository location , you will get it from “User Links > User Home” like the image bellow ) and locate the private key which we have generated earlier (for me its demokey.ppk)

Now you have to enter passphrase which you have set during key generation.

That’s it , we have successfully configured our repository with TortoiseGIT client.

Now we will add a file named “demo_text_file.txt” and it to our repository.To that we have to right click the folder again and do as per image bellow.

Then confirm the add operation :

Now you have to do as per following image sequence to push the fine into server.

We are going to change some text in our file and give Git Commite as per image bellow:

We have to put a message before committing something into our brunch in Message section, We also can put signed off signature as bellow:

To finally push the file into server we have to click push :

And the we have to select in which brunch we should to push in server and click ok.

No to sink with others commit we have to update the code base as bellow.

Then select “Pull” as bellow:

There are lots more Git operation we can perform through TortoiseGIT but in this tutorial I just have shown how to do the basic operation. Hope in future I will post more advance feature & operation of GIT.

Thanks

That’s all for today .

To know more visit to my blog [ http://blog.actcode.com/ ]

Bye

PHP overloading ( method overloading and property overloading)

2010-05-16T00:35:00.000+06:00

Hello All

Today I will focus on overloading method and property in PHP. Unlike other language Java/C# overloading is working in a little bit different way for PHP.

Normally we can overload a method by providing different/varying argument(s) ,but in PHP it should have to create through some magic methods.

These magic methods are as bellow:

(For overloading property)

void __set ( string $name , mixed $value )

mixed __get ( string $name )

bool __isset ( string $name )

void __unset ( string $name )

(For overloading method)

mixed __call ( string $name , array $arguments )

mixed __callStatic ( string $name , array $arguments )

It will be better to describe the operation inside code comment rather that bookish thing hear. Please go through the code comment to get know what is gonging over there to perform overloading .

<?php
class PhpOverloading {
  
  /* Property overloading -start- */
  private $_data = array ();
  
  public function __set($name, $value) {
    /*
     * set the key value in the $_data private
     * variable.
     * */
    $this->_data [$name] = $value;
  }
  
  public function __get($name) {
    /*
     * Retrieve the value of key which we have
     * set through __set method.
     * */
    return $this->_data [$name];
  }
  
  public function __isset($name) {
    /*
     * Check wheather the key exist or not. 
     * */
    return isset ( $this->_data [$name] );
  }
  
  public function __unset($name) {
    /*
     * Unset the value of key.
     * */
    unset ( $this->_data [$name] );
  }
  
  /* Property overloading -end- */
  
  /* Method overloading -start- */
  public function __call($name, $argument) {
    /*
     * perform your operation as needed,
     * I just used a switch case to show how 
     * we can set the dynamic method with parameters.
     * */
    
    switch ($name) {
      case ('First') :
        echo "This is the first dyanamic method and arguments are " . implode ( ',', $argument );
        break;
      case ('Second') :
        echo "2nd method and the arguments are {$argument[1]} and {$argument[2]}";
        break;
      default :
        echo "Method unhandled with the name {$name} and arguments are " . implode ( ',', $argument );
    }
  }
  
  public static function __callstatic($name, $argument) {
    
    /*
     * It's similar as __call but works as static method
     * call. 
     * */
    switch ($name) {
      case ('FirstStatic') :
        echo "Static first dyanamic method and arguments are " . implode ( ',', $argument );
        break;
      case ('SecondStatic') :
        echo "Static 2nd method and the arguments are {$argument[1]} and {$argument[2]}";
        break;
      default :
        echo "Static method unhandled with the name {$name} and arguments are " . implode ( ',', $argument );
    }
  }
  
/* Method overloading -end- */
}
$phpOverloading = new PhpOverloading ();
echo 'Property overloading output -start-';
echo "<br /><br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
$phpOverloading->dynamicProperty = "new property injected";
echo "<br />";
echo $phpOverloading->dynamicProperty;
echo "<br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
unset ( $phpOverloading->dynamicProperty );
echo "<br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
echo "<br /><br />";
echo 'Property overloading output -end-';
echo "<br /><br />";
echo 'Method overloading output -start-';
echo '<br /><br />';
$phpOverloading->First ( 'one', 'two', 'three' );
echo "<br />";
$phpOverloading->Second ( '1', '2' );
echo "<br />";
$phpOverloading->UnHandledMethod ( '1', '2' );
echo "<br /><br />";
echo 'staic method overloading';
echo "<br /><br />";
PhpOverloading::FirstStatic ( 'one', 'two', 'three' );
echo "<br />";
PhpOverloading::SecondStatic ( '1', '2' );
echo "<br />";
PhpOverloading::UnHandledStaticMethod ( '1', '2' );
echo "<br /><br />";
echo 'Method overloading output -end-';
/*
 * final output is as bellow:
 
Property overloading output -start-
bool(false) 
new property injected
bool(true) 
bool(false) 
Property overloading output -end-
Method overloading output -start-
This is the first dyanamic method and arguments are one,two,three
2nd method and the arguments are 2 and 
Method unhandled with the name UnHandledMethod and arguments are 1,2
staic method overloading
Static first dyanamic method and arguments are one,two,three
Static 2nd method and the arguments are 2 and 
Static method unhandled with the name UnHandledStaticMethod and arguments are 1,2
Method overloading output -end-
 * 
 * */

You may check my other posts from my [ Blog ] .

Please provide your feedback.

Thanks

That's all for today.

BYE

PHP overloading ( method overloading and property overloading)

2010-05-16T00:24:00.001+06:00

Hello All

Today I will focus on overloading method and property in PHP. Unlike other language Java/C# overloading is working in a little bit different way for PHP.

Normally we can overload a method by providing different/varying argument(s) ,but in PHP it should have to create through some magic methods.

These magic methods are as bellow:

(For overloading property)

void __set ( string $name , mixed $value )

mixed __get ( string $name )

bool __isset ( string $name )

void __unset ( string $name )

(For overloading method)

mixed __call ( string $name , array $arguments )

mixed __callStatic ( string $name , array $arguments )

It will be better to describe the operation inside code comment rather that bookish thing hear. Please go through the code comment to get know what is gonging over there to perform overloading .

<?php
class PhpOverloading {
  
  /* Property overloading -start- */
  private $_data = array ();
  
  public function __set($name, $value) {
    /*
     * set the key value in the $_data private
     * variable.
     * */
    $this->_data [$name] = $value;
  }
  
  public function __get($name) {
    /*
     * Retrieve the value of key which we have
     * set through __set method.
     * */
    return $this->_data [$name];
  }
  
  public function __isset($name) {
    /*
     * Check wheather the key exist or not. 
     * */
    return isset ( $this->_data [$name] );
  }
  
  public function __unset($name) {
    /*
     * Unset the value of key.
     * */
    unset ( $this->_data [$name] );
  }
  
  /* Property overloading -end- */
  
  /* Method overloading -start- */
  public function __call($name, $argument) {
    /*
     * perform your operation as needed,
     * I just used a switch case to show how 
     * we can set the dynamic method with parameters.
     * */
    
    switch ($name) {
      case ('First') :
        echo "This is the first dyanamic method and arguments are " . implode ( ',', $argument );
        break;
      case ('Second') :
        echo "2nd method and the arguments are {$argument[1]} and {$argument[2]}";
        break;
      default :
        echo "Method unhandled with the name {$name} and arguments are " . implode ( ',', $argument );
    }
  }
  
  public static function __callstatic($name, $argument) {
    
    /*
     * It's similar as __call but works as static method
     * call. 
     * */
    switch ($name) {
      case ('FirstStatic') :
        echo "Static first dyanamic method and arguments are " . implode ( ',', $argument );
        break;
      case ('SecondStatic') :
        echo "Static 2nd method and the arguments are {$argument[1]} and {$argument[2]}";
        break;
      default :
        echo "Static method unhandled with the name {$name} and arguments are " . implode ( ',', $argument );
    }
  }
  
/* Method overloading -end- */
}
$phpOverloading = new PhpOverloading ();
echo 'Property overloading output -start-';
echo "<br /><br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
$phpOverloading->dynamicProperty = "new property injected";
echo "<br />";
echo $phpOverloading->dynamicProperty;
echo "<br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
unset ( $phpOverloading->dynamicProperty );
echo "<br />";
var_dump ( isset ( $phpOverloading->dynamicProperty ) );
echo "<br /><br />";
echo 'Property overloading output -end-';
echo "<br /><br />";
echo 'Method overloading output -start-';
echo '<br /><br />';
$phpOverloading->First ( 'one', 'two', 'three' );
echo "<br />";
$phpOverloading->Second ( '1', '2' );
echo "<br />";
$phpOverloading->UnHandledMethod ( '1', '2' );
echo "<br /><br />";
echo 'staic method overloading';
echo "<br /><br />";
PhpOverloading::FirstStatic ( 'one', 'two', 'three' );
echo "<br />";
PhpOverloading::SecondStatic ( '1', '2' );
echo "<br />";
PhpOverloading::UnHandledStaticMethod ( '1', '2' );
echo "<br /><br />";
echo 'Method overloading output -end-';
/*
 * final output is as bellow:
 
Property overloading output -start-
bool(false) 
new property injected
bool(true) 
bool(false) 
Property overloading output -end-
Method overloading output -start-
This is the first dyanamic method and arguments are one,two,three
2nd method and the arguments are 2 and 
Method unhandled with the name UnHandledMethod and arguments are 1,2
staic method overloading
Static first dyanamic method and arguments are one,two,three
Static 2nd method and the arguments are 2 and 
Static method unhandled with the name UnHandledStaticMethod and arguments are 1,2
Method overloading output -end-
 * 
 * */

You may check my other posts from my [ Blog ]

Please provide your feedback.

Thanks

That's all for today.

BYE

Control inside repeater row ASP.NET

2010-02-28T14:05:00.000+06:00

Hello All

Few days back I was struggling with a repeater problem , where I have to get a value of dropdown list on a button click event which is inside repeater. Eventually I come up with a solution through googling. What I have faced was get the value of appropriate dropdown list while clicking the button of a particular repeater’s row.

It’s being hard to describe rather that visualize :) isn’t it ! ( proposed solution should be as image bellow)

My aspx markup is as bellow :

 <asp:Repeater runat="server" ID="rptTeamInfo" OnItemDataBound="rptTeamInfo_ItemDataBound" OnItemCommand="rptTeamInfo_ItemCommand">
               <ItemTemplate>
                <div class="side2">
                <div class="form">
                    <a href="#">delete</a><a href="#">edit /</a>
                    <ul class="p2">           
                      <span class="style1">[ <%#Eval("team_name")%> ]</span> - [ <%#Eval("creation_date")%>]<br />
                      <span class="style2">[<asp:Label runat="server" Text="ADMIN bla bla bla"></asp:Label>] - [ <%#Eval("team_leader")%>]</span> - [ <%#Eval("description")%>]
                     </ul>
                </div>                                                                        
                <div class="form2">
                <asp:ImageButton id="imgAddToTeam"  CommandName="select" CommandArgument='<%# Eval("team_id") %>'  ImageUrl="images/Add_to_team.png" runat="server" style="margin:10px;" align="right"></asp:ImageButton>
                <asp:DropDownList ID="ddlUserList" runat="server">
                
                </asp:DropDownList>
                    
                </div>
                <div class="row1">
                        <ul class="column">
                            <p><img src="images/name.png" /> Name</p>
                        </ul>
                        <ul class="column2">
                            <p><img src="images/username.png" /> Username</p>
                        </ul>
                        <ul class="column3">
                            <p><img src="images/username.png" /> Access</p>
                        </ul>
                </div>
                <div class="row2">                
                 <asp:Repeater ID="rptUserInfo"  OnItemDataBound="rptUserInfo_ItemDataBound" runat="server">
                       <ItemTemplate>
                    <asp:LinkButton id="lnkUserDelete" onclick="lnkUserDelete_Click" runat="server">delete</asp:LinkButton>
                    <ul class="column">
                        <p> <asp:Label runat="server" id="lblFirstNameIn"></asp:Label> <asp:Label runat="server" id="lblLastNameIn"></asp:Label></p>
                    </ul>
                    <ul class="column2">
                        <p> <asp:Label runat="server" id="lblUserIDIn"></asp:Label></p>
                    </ul>
                    <ul class="column3">
                        <p><asp:Label runat="server" id="lblUserTypeIn"></asp:Label></p>
                    </ul>
                        </ItemTemplate>                             
                 </asp:Repeater>                
                </div>
            </div>
               </ItemTemplate>
               </asp:Repeater>

And my code behind file is as bellow :

using System;
using System.Web.UI.WebControls;
using ClassLibrary1.UTILITY;

namespace WebDoc
{
    public partial class ManageTeam : System.Web.UI.Page
    {
        public int CurrentTeamID { get; set; }

        protected void Page_Load(object sender, EventArgs e)
        {
            lblUserId.Text = BUSessionUtility.BUSessionContainer.UserName;
            ManageTeamDAL manageTeamDAL = new ManageTeamDAL();
            rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

            rptTeamInfo.DataBind();

        }
        protected void btnLogOut_Click(object sender, EventArgs e)
        {
            BUSessionUtility.BUSessionContainer.UserName = string.Empty;
            BUSessionUtility.BUSessionContainer.UserType = string.Empty;
            Response.Redirect("~/LoginUI.aspx");
        }

        protected void rptTeamInfo_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            DropDownList ddlUserList = (DropDownList)(e.Item.FindControl("ddlUserList"));

            ManageTeamDAL manageTeamDAL = new ManageTeamDAL();
            ddlUserList.DataSource = manageTeamDAL.GetUsersByManagerID(BUSessionUtility.BUSessionContainer.UserName);
            ddlUserList.DataTextField = "id";
            ddlUserList.DataValueField = "id";
            ddlUserList.DataBind();

            Repeater rptUserInfo = (Repeater)(e.Item.FindControl("rptUserInfo"));

            var row = e.Item.DataItem;
            rptUserInfo.DataSource = manageTeamDAL.GetUsersByAssignedTeamID(((team_info)(row)).team_id);
            rptUserInfo.DataBind();


        }

        protected void rptTeamInfo_ItemCommand(object source, RepeaterCommandEventArgs e)
        {
            if (e.CommandName == "select")
            {
                ImageButton imgAddToTeam = (ImageButton)e.CommandSource;

                DropDownList ddlUserList = (DropDownList)rptTeamInfo.Items[e.Item.ItemIndex].FindControl("ddlUserList");

                ManageTeamDAL manageTeamDAL = new ManageTeamDAL();

                manageTeamDAL.AssignUserInTeam(int.Parse(imgAddToTeam.CommandArgument), ddlUserList.SelectedValue.ToString());

                rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

                rptTeamInfo.DataBind();
            }
        }

        protected void rptUserInfo_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            Label lblFirstName = (Label)(e.Item.FindControl("lblFirstNameIn"));
            Label lblLastName = (Label)(e.Item.FindControl("lblLastNameIn"));
            Label lblUserID = (Label)(e.Item.FindControl("lblUserIDIn"));
            Label lblUserType = (Label)(e.Item.FindControl("lblUserTypeIn"));
            LinkButton lnkUserDelete = (LinkButton)(e.Item.FindControl("lnkUserDelete"));

            var row = e.Item.DataItem;

            lblFirstName.Text = ((user_info)(row)).f_name;
            lblLastName.Text = ((user_info)(row)).l_name;
            lblUserID.Text = ((user_info)(row)).id;
            lblUserType.Text = ((user_info)(row)).user_type;
            lnkUserDelete.CommandArgument = ((user_info)(row)).id;


        }

        protected void lnkUserDelete_Click(object sender, EventArgs e)
        {
            ManageTeamDAL manageTeamDAL = new ManageTeamDAL();

            manageTeamDAL.DeleteUserformTeam(((LinkButton)(sender)).CommandArgument);

            rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

            rptTeamInfo.DataBind();
        }

    }
}

Not all codes are important here and I will escape the data binding part as its not the focus of today’s topic. Now I will focus what we should do to perform our basic task.

first of all we have to do one most important thing *** MAKE EnableViewState="false" *** If ViewState is in true condition your are not going to handle OnItemCommand event which will significantly react for your particular row’s activity.

<asp:Repeater runat="server" ID="rptTeamInfo" OnItemDataBound="rptTeamInfo_ItemDataBound" OnItemCommand="rptTeamInfo_ItemCommand">

<asp:ImageButton id="imgAddToTeam" CommandName="select" CommandArgument='<%# Eval("team_id") %>' ImageUrl="images/Add_to_team.png" runat="server" style="margin:10px;" align="right"></asp:ImageButton>

<asp:DropDownList ID="ddlUserList" runat="server">

</asp:DropDownList>

</ItemTemplate>

</asp:Repeater>

The event handler “rptTeamInfo_ItemCommand” for the the event “OnItemCommand” is as bellow.

protected void rptTeamInfo_ItemCommand(object source, RepeaterCommandEventArgs e)
{
    if (e.CommandName == "select")
    {
        ImageButton imgAddToTeam = (ImageButton)e.CommandSource;
        
        DropDownList ddlUserList = (DropDownList)rptTeamInfo.Items[e.Item.ItemIndex].FindControl("ddlUserList");
    
        ManageTeamDAL manageTeamDAL = new ManageTeamDAL();

        manageTeamDAL.AssignUserInTeam( int.Parse(imgAddToTeam.CommandArgument),ddlUserList.SelectedValue.ToString() );

        rptTeamInfo.DataSource = manageTeamDAL.GetGroupsByManagerID(BUSessionUtility.BUSessionContainer.UserName);

        rptTeamInfo.DataBind();
    }
}

We are passing the “CommandName” and “CommandArgument” through our image button which will check the command name in code behind and act with the command argument parameter.

We can get our ImageButton and DropdownList is as bellow from our code behind.

ImageButton imgAddToTeam = (ImageButton)e.CommandSource;

DropDownList ddlUserList = (DropDownList)rptTeamInfo.Items[e.Item.ItemIndex].FindControl("ddlUserList");

And selet the value of dropdown as bellow.

ddlUserList.SelectedValue

In this way we can accomplish our task regarding the repeater row’s control manipulation.

Thats all for today.

BYE

Dependency Injection with Ninject in .NET

2009-12-23T23:32:00.000+07:00

Hello All

From last few months I was not working on .NET platform so haven’t get enough time to write something fruitful on .NET technology. But from last few few days I was thinking to do something with IoC . There are many DI tools to perform DI in .NET but I found Ninject useful as well as light waited and easily implementable. So lets start to make our hand dirty with the Ninject (there are many advanced level use of Ninject library but in this article I will simply show how to do DI with Ninject framework).

My project structure is as following .

In this example I’m taking 2 types of engine and 2 types of set and through Ninject DI I’ll inject one of each for a car. Fore the sake of simplicity I will place the code file accordingly and describe through code comment.

In my “DependencyInjection.Core” project I took 2 interfaces: 1.IEngine 2.ISeat

IEngine.cs is as following :

namespace DependencyInjection.Core
{
   public interface IEngine
    {
       string EngineType(string carName);
    }
}

I’m also taking 2 other classes 1.DieselEngine and 2.PetrolEngine . Both of the classes implements IEngine interface.
DieselEngine.cs is as following :

namespace DependencyInjection.Core
{
   public  class DieselEngine : IEngine
    {
       public string EngineType(string carName)
       {
           return string.Format("This {0} runs on diesel.", carName);
       }
    }
}

PetrolEngine.cs is as following :

namespace DependencyInjection.Core
{
  public class PetrolEngine : IEngine
    {
        public string EngineType(string carName)
        {
            return string.Format("This {0} runs on petrol.", carName);
        }
    }
}

Now start for another type of interface implementation ISeat . This part also is as above.
ISeat.cs is as following :

namespace DependencyInjection.Core
{
   public interface ISeat
    {
       string SeatType(string carName);
    }
}

Two other classes 1.LeatherSeat and 2.PlasticSeat . Both of the classes implements ISeat interface.
LeatherSeat.cs is as follwong:

namespace DependencyInjection.Core
{
   public class LeatherSeat : ISeat
    {
        #region ISeat Members

        public string SeatType(string carName)
        {
          return string.Format( "This {0}'s seats are of leather.",carName);
        }

        #endregion       
    }
}

PlasticSeat.cs is as following :

namespace DependencyInjection.Core
{
   public class PlasticSeat : ISeat
    {
        #region ISeat Members

        public string SeatType(string carName)
        {
            return string.Format("This {0}'s seats are of plastic.", carName);
        }

        #endregion
    }
}

In this point I’m adding reference of “Ninject.Core.dll” with my “DependencyInjection.Core” project which I have downloaded from Ninject’s site. Now in my main class “Car” I’m going to inject one type of engine and another type of seat which I have mapped (DI mapping) through “IocMapper” class as bellow.
Car.cs is as bellow :

using Ninject.Core;

namespace DependencyInjection.Core
{
    public class Car
    {
        public IEngine CarEngine { get; set;}
        public ISeat   CarSeat   { get; set;}

        [Inject]
        public Car(IEngine engine , ISeat seat)
        {
            CarEngine   = engine;
            CarSeat     = seat;
        }

        
        public string GetEngineInformation(string carName)
        {
           return CarEngine.EngineType(carName);
        }


        public string GetSeatInformation(string carName)
        {
            return CarSeat.SeatType(carName);
        }
    }
}

In the above file “ [Inject] “ attribute is place above the Car constructer to make it definable to Ninject so that Ninject can inject mapped object as described in “IocMapper” class.
I have taken another console application project named “DependencyInjection” in which I placed my “IocMapper” class.
IocMapper.cs is as following :

using Ninject.Core;

using DependencyInjection.Core;

namespace DependencyInjection
{
    public class IocMapper : StandardModule
    {
        public override void Load()
        {
            Bind<IEngine>().To<DieselEngine>();
         
            Bind<ISeat>().To<LeatherSeat>();
        }
    }
}

Now in program class I defined the kernel constructer and and initialize my car object.
Program.cs file is as bellow :

using System;
using Ninject.Core;
using DependencyInjection.Core;

namespace DependencyInjection
{
    class Program
    {
        static void Main(string[] args)
        {
            IKernel kernel = new StandardKernel(new IocMapper());

            Car car = new Car(kernel.Get<IEngine>(), kernel.Get<ISeat>());

            Console.WriteLine(car.GetEngineInformation("Toyota"));
           
            Console.WriteLine(car.GetSeatInformation("BMW"));
            
            Console.ReadKey();

        }
    }
}

We can do more advance level of conditional binding with Ninject. Hope in near future I will throw a post on advance use of Ninject.
That’s all for today.
BYE

.NET application logging with Log4net in Console , File & Database

2009-11-13T17:44:00.000+07:00

Hello All

Today I will go through logging with Log4net. Log4Net is a logging framework ( a rich library) for .NET. Log4Net is popular for its simplicity and robustness. We can write log in various way though we generally write log only in file we we can also mail log, show in console,save in datatbase as well as write in file in different ways.

First we have to download the Log4Net and add the log4net.dll in our implementation project. In the example I have take 2 projects named LogWriter and LogRunner accordingly, In one project I have implemented the logging and in another I execute that logging method.

My project structure is as image bellow :

In the LogWriter I have take two class as bellow :

LogLevel.cs: In this class I simply define a enum which basically helps to define my log level in my LogUtil class.

namespace LogWriter
{
    public enum LogLevel
    { 
        DEBUG,
        ERROR,
        FATAL,
        INFO,
        WARN    
    }
}

LogUtil.cs: In this class I have a static method named WriteLog which take 2 parameters one define log level and another take log message as string.

using log4net;
using log4net.Config;

namespace LogWriter
{
    public static class LogUtil
    {
        private static ILog logger = LogManager.GetLogger(typeof(LogUtil));

        static LogUtil()
        {
            XmlConfigurator.Configure();
        }

        public static void WriteLog(LogLevel logLevel,string log)
        {
            if (logLevel.Equals(LogLevel.DEBUG))
            {
                logger.Debug(log);
            }
            else if (logLevel.Equals(LogLevel.ERROR))
            {
                logger.Error(log);
            } 
            else if (logLevel.Equals(LogLevel.FATAL))
            {
                logger.Fatal(log);
            } 
            else if (logLevel.Equals(LogLevel.INFO))
            {
                logger.Info(log);
            } 
            else if (logLevel.Equals(LogLevel.WARN))
            {
                logger.Warn(log);
            }             
        
        }
    }
}

As I am writing a console application so my mail runner file is Program.cs which is as bellow but you can follow the same procedure in different place as per you requirement.

using System;
using LogWriter;

namespace LogRunner
{
    class Program
    {
        static void Main(string[] args)
        {
            try {
                throw new Exception();
            }

            catch (Exception exc)
            {
                    LogUtil.WriteLog(LogLevel.DEBUG, "Debug mode logging");
                    LogUtil.WriteLog(LogLevel.ERROR, "Error mode logging");
                    LogUtil.WriteLog(LogLevel.FATAL, "Fatal mode logging");
                    LogUtil.WriteLog(LogLevel.INFO, "Info mode logging");
                    LogUtil.WriteLog(LogLevel.WARN, "Warn mode logging");
    
                    Console.ReadKey();
            }
        }
    }
}

Now one of the most important thing I will focus is log4net configuration. We can configure it from web.config or app.config . In my example I have configured it app.config file in my LogRunner project. In the app.config file follow the commented section.

My configuration file is as bellow , please go through the commented line to get know in detail such as log file rolling, max log file number & size, Log level etc.

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

    <configSections>

        <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />

    </configSections>


    <log4net>

        <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">

            <!-- Log file locaation -->
            
            <param name="File" value="C:\Users\sanzeeb\Documents\Visual Studio 2008\Projects\Solution1\LogWriter\Log\" />

            <param name="AppendToFile" value="true" />

            <!-- Maximum size of a log file -->
            <maximumFileSize value="2KB" />

            <!--Maximum number of log file -->
            <maxSizeRollBackups value="8" />

            <!--Set rolling style of log file -->
            <param name="RollingStyle" value="Composite" />

            <param name="StaticLogFileName" value="false" />

            <param name="DatePattern" value=".yyyy-MM-dd.lo\g" />

            <layout type="log4net.Layout.PatternLayout">

                <param name="ConversionPattern" value="%d [%t] %-5p  %m%n" />

            </layout>

        </appender>

        <!-- Appender layout fix to view in console-->
        <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender" >

            <layout type="log4net.Layout.PatternLayout">

                <param name="Header" value="[Header]\r\n" />

                <param name="Footer" value="[Footer]\r\n" />

                <param name="ConversionPattern" value="%d [%t] %-5p  %m%n" />

            </layout>

        </appender>

      
        <!-- Database appender -->

        <!--
        You need to create a table as bellow to insert log in database for MSSQL server.
        
        CREATE TABLE [dbo].[Log] (
        [Id] [int] IDENTITY (1, 1) NOT NULL,
        [Date] [datetime] NOT NULL,
        [Thread] [varchar] (255) NOT NULL,
        [Level] [varchar] (50) NOT NULL,
        [Logger] [varchar] (255) NOT NULL,
        [Message] [varchar] (4000) NOT NULL,
        [Exception] [varchar] (2000) NULL
        )
        -->

        <appender name="AdoNetAppender" type="log4net.Appender.AdoNetAppender">
            <bufferSize value="100" />
            <connectionType value="System.Data.SqlClient.SqlConnection, System.Data, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
            <connectionString value="Data Source=SANZEEB-PC\SQLEXPRESS;Initial Catalog=AppTesterDB;Integrated Security=True" />
            <commandText value="INSERT INTO Log ([Date],[Thread],[Level],[Logger],[Message],[Exception]) VALUES (@log_date, @thread, @log_level, @logger, @message, @exception)" />
            <parameter>
                <parameterName value="@log_date" />
                <dbType value="DateTime" />
                <layout type="log4net.Layout.RawTimeStampLayout" />
            </parameter>
            <parameter>
                <parameterName value="@thread" />
                <dbType value="String" />
                <size value="255" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%thread" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@log_level" />
                <dbType value="String" />
                <size value="50" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%level" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@logger" />
                <dbType value="String" />
                <size value="255" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%logger" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@message" />
                <dbType value="String" />
                <size value="4000" />
                <layout type="log4net.Layout.PatternLayout">
                    <conversionPattern value="%message" />
                </layout>
            </parameter>
            <parameter>
                <parameterName value="@exception" />
                <dbType value="String" />
                <size value="2000" />
                <layout type="log4net.Layout.ExceptionLayout" />
            </parameter>
        </appender>

        <root>

            <level value="DEBUG" />

            <!--
            Log level priority in descending order:
            
            FATAL = 1 show  log -> FATAL 
            ERROR = 2 show  log -> FATAL ERROR 
            WARN =  3 show  log -> FATAL ERROR WARN 
            INFO =  4 show  log -> FATAL ERROR WARN INFO 
            DEBUG = 5 show  log -> FATAL ERROR WARN INFO DEBUG
            -->

            <!—To write log in file -->
            <appender-ref ref="LogFileAppender" />

            <!--To view log in console -->
            <appender-ref ref="ConsoleAppender" />
            
            <!--To write log in file batabase -->
            <appender-ref ref="AdoNetAppender" />

        </root>

    </log4net>

</configuration>

Hope this will help to improve your logging in your .NET application.

Thanks

That’s all for today.

BYE

ULM Class Diagram

2009-08-21T22:12:00.000+07:00

Hello All

Today I will go through with UML class diagram. It’s like old wine in old bottle ;) . We all know that these are very basic but now a days people just stat to do coding without making any class or activity diagram, so eventually they fall in a design related issue if the system becomes huge.

Again UML is more impotent to understand any complex system which is properly documented in UML diagram.UML makes our life simple through notifying us the design fault.

So let’s start the old song again.

Class:

Generally there are 3 components in the class icon as following.

1. Class Name

2. Attributes

3. Functions / Methods

Visibility:

Visibility of class diagram represents the accessibility of the class members. Visibility notations are as bellow .

Notations	Access type
-	Private
+	Public
~	Protected

Association:

When two objects are connected with each other then it can be represent as association. For students and seminar we can use association notation where students are attending in seminar.

Multiplicity Indicators:

Multiplicity indicates the countable objects relation with other objects.

Indicator	Meaning
0..1	Zero or one
1	One only
0..*	Zero or more
1..*	One or more
n	Only n (where n > 1)
0..n	Zero to n (where n > 1)
1..n	One to n (where n > 1)

Composition:

Composition represents with a black diamond. It represents that a component strongly depends on another component. Suppose we have two objects one is circle and another is point. In that case a circle consists of many points.

Aggregation:

When an object form with another object(s) but not mandatory to form the main object then its denoted by a diamond. Suppose student and school object can represent with aggregation relationship.

Inheritance:

When one object inherits property from any parent object then the sign denoted with a triangle shape arrow.

Thanks

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

Agile Scrum and traditional software development ( SDLC ) terms.

2009-07-25T12:55:00.000+07:00

Hello All

Few days back our boss focused on how to map the traditional software development term with Agile development term as a result I think it will be a good topic to discus and share our thoughts. We Agile practitioner always use some terms such as sprint, product backlog, burn-down chart etc. But people who are not used to Agile can hardly understand these terms where as these things are similar as traditional SDLC terms.

Today I will try to focus some of this Agile terms and try to make a equivalent SDLC terms, so that people can adopt the Agile practice easily.

In this post I will follow Scrum framework for the Agile development. There are some other Agile framework such as AUP,XP,FDD etc.

Agile Development Process:

In the following picture (it’s an Agile development process) we can see some agile terms such as Product backlog, Sprint Backlog, sprint and there are also some other terms like product owner, scrum master, daily scrum meeting, velocity, retrospective etc.

Roles:

Product Owner: Product owner is the client. According to their order the software will develop and they will clarify the requirement for the developers so that developers can develop the exact efficient software for the customer.

Scrum Master: Scrum master plays a similar type of role as project manager. But as the Agile team is self organized so scrum master doesn’t involve deeply in a project as traditional project manager. Scrum master takes initiative on the impediments and managing the process working perfectly so that the goal meets in the desired time frame (sprint).

Teams: In general a team means group of self organized developers who will develop the software.

Projects Terms:

Product backlog: Product backlog is the collection of requirements of a system. This requirements are placed according to the development priority, so that the high priority requirements are develop in the early phases.

Sprint: Sprint is like the time frame of an incremental development process. In a sprint the team fixes what to do in this cycle and deployment. Developers develop a deliverable product in a sprint and deploy it in client end. Once the tasks are fixed for a sprint the developer should not be interrupt with additional requirement and mass requirement change. If it’s necessary, the tasks will add in product backlog with high priority so that they can add in next sprint’s planning.

Sprint backlog: Sprint backlog is the set of high priority tasks taken from the set of product backlog which will develop in the current sprint and deploy in client end.

Scrum meeting: Scrum meeting is a daily short standing meeting where each team member will express what problem(s) s/he has faced last day and what s/he will do today. This meeting is extremely focused.

Retrospective: At the last day the team will discussed what went good what went band and what are the opportunity so that in the next sprint they can take initiative according to the retrospective.

Burndown chart: There are different types of burndown charts. Which represents the development process through graph, so that an Agile team member can get to know what project’s condition in a simple view.

Velocity: An agile team can estimate how much effort they can put in product backlog for one sprint. This velocity is determined from previous sprint’s average data. This velocity can be used to predict the project effort planning and team's productivity .

Thanks

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

LinkButton ,Label inside Repeater - ASP.NET

2009-06-13T01:26:00.000+06:00

Hello All

Today I will show you how to fire Link Button's event with argument and initialize a label inside of a repeater. To do that first we have to take LinkButton and a Label control inside the ItemTemplate of the repeater. Then we have to initialize the the Label from OnItemDataBound event of the repeater. In the following code blocks its shown how to perform the job.

Following is my Default.aspx file:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TestProject._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Selected ID:<asp:Label ID="lblSelectedID" runat="server" Text=""></asp:Label>
        <br />
        <asp:Repeater ID="rptContent" runat="server" OnItemDataBound="rptContent_ItemDataBound">
            <ItemTemplate>
                <asp:Label ID="lblName" runat="server">
                </asp:Label>
                <asp:LinkButton ID="lnkShowData" runat="server" OnCommand="LinkButton_Command" CommandArgument='<%# Eval("key") %>'
                    Text="[Show]" CommandName="Show"></asp:LinkButton>
                <br />
            </ItemTemplate>
        </asp:Repeater>
    </div>
    </form>
</body>
</html>

In the above code I have bind the "key" as CommandArgument in LinkButton which will be initialize form the code behind file.

My code behind is as following:

using System;
using System.Collections.Generic;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace TestProject
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            rptContent.DataSource = this.userInformation();
            rptContent.DataBind();
        }

       // Fire the link button event from inside repeater.
       protected void LinkButton_Command(object sender, CommandEventArgs e)
        {
           lblSelectedID.Text = e.CommandArgument.ToString();
        }

        protected void rptContent_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            // find the label control by id
            Label lblDynaLabel = (Label)(e.Item.FindControl("lblName"));


            // bind the data from repeater data source (value from the dictionary)with the label control.
            lblDynaLabel.Text = DataBinder.Eval(e.Item.DataItem,"value").ToString();
        }

        #region Private method

        private Dictionary<int, string> userInformation()
        {
            Dictionary<int, string> userData = new Dictionary<int, string>();

            userData.Add(1, "Max");
            userData.Add(2, "Top");
            userData.Add(3, "Avg");

            return userData;
        }
        #endregion
    }
}

The output will be as bellow:

Selected ID:1
Max [Show]
Top [Show]
Avg [Show]

In the private method section I have created a simple mathod named userInformation, which contains dictionary data collection to bind it with repeater.Hope that above code blocks will help.

Thanks

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

Print C# properties in aspx,ascx page from code behind file.

2009-05-28T14:43:00.000+06:00

Hello all

Today I will show you how to print something in aspx or ascx page from code behind file.In this example I have taken a “Web User Control” named “WebUserControl.ascx”. What I wanted to do was, print a value of a variable in “.ascx” page where the variable has been initialize from “.ascx.cs” better to say code behind file.

To do that we have taken a property in “WebUserControl.ascx.cs” code behind file named “PrintValue” and make it a public property and assign a string value on PageLoad event as bellow :

using System;

public partial class WebUserControl : System.Web.UI.UserControl
{
    public string PrintValue { get; set; }
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack)
            PrintValue = "Postback";
        else
            PrintValue = "Not postback";
    }
}

Now I have printed the value of the property in my “WebUserControl.ascx” page as bellow.One thing we have to remember that the script tag should be like : <%= %> to print something in it.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %>

The page has - <%= PrintValue %>

Now we can use the control in our page to show the state of the page.
Thats all for today.
Bye

User ScrumPad for your Agile based projects.

File streaming in .NET

2009-05-04T12:28:00.000+06:00

Hello All

Today i will focus on simple file steaming in .NET which I have to implement it in one of my project.Though it’s not optimize but its OK for serve small purpose.

In the project I have to read a PDF file from the server and with FileStream and Flash it with Response to the client side.

the code is as bellow.

private void generateRequestedPDF()
{
    try
    {
        string file = Path.GetFileName(Request.QueryString["RefID"]);// get file name from query string.use your custom method." 

        FileStream fileStream = new FileStream(Server.MapPath(@"~\uploadedFiles\" + file), FileMode.Open);
        long fileSize = fileStream.Length;

        byte[] buffer = new byte[(int)fileSize];
        fileStream.Read(buffer, 0, (int)fileSize);
        fileStream.Close();

        Response.Clear();

        Response.ContentType = "Application/pdf";// use your custom type"
        Response.AddHeader("Content-Disposition", "inline; filename=" + file);

        Response.OutputStream.Write(buffer, 0, (int)fileSize);
        Response.Flush();
        Response.Close();
    }
    catch (Exception exc)
    {
    //  throw exc;
        this.writeLogWarn(exc);
        Response.Redirect("~/Pages/Content/TechCorner.aspx");
    }
   
}

thats all for today.
BYE

User ScrumPad for your Agile based projects.

Consume WCF Service

2009-04-11T19:06:00.000+06:00

Hello all

Today I will show how to consume a WCF service. To go through this before, I have created a WCF service [ Creating WCF Service ] , which I will consume for my project in this article. Consuming WCF Service is as simple as consuming a simple webservice through Visual Studio 2008.

First I am taking an empty Web project named ConsumedWCF.

Now I will add a service reference which I have created before [ Creating WCF Service ] in this ConsumedWCF project as bellow:

In my previously created WCF service I have got a URL for my service "http://localhost:49530/DataService.svc?wsdl", I have pasted the URL in the Address box. One thing we should have to remember that,to consume the service we have to run that service during development.

Now I will consume the service from my Default.aspx . My Default.aspx.cs content is as bellow:

using System;
using ConsumeWCF.ServiceReference1;

namespace ConsumeWCF
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
           DataServiceClient cl = new DataServiceClient();
           Response.Write( cl.GetUserDataFromService().UserName);
           Response.Write("<br />");
           Response.Write(cl.GetUserDataFromService().UserLocation);
           Response.Write("<br />");
           Response.Write(  cl.GetUserRestrictionFromService("1"));
           Response.Write("<br />");
           Response.Write(cl.GetUserRestrictionFromService("23"));
           
        }
    }
}

The above code will print the values which we have consumed form the WCF service.

Thanks

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

Creating WCF Service

2009-03-31T16:21:00.000+06:00

Hello all

Today I will try to demonstrate how to create simple web service through WCF. To get into WCF first we have to know some basic principal of WCF and its "ABC".

Address : the location of the service.

Bind: how to get service.

Contract: service action.

In this tutorial I will not describe details about WCF.My basic focus will be on creating a WCF service through Visual Studio 2008

First open a new WCF project:

In my sample project I have named "TestWCFService" for creating the service.

In the solution explorer you will found IService1.cs interface , Service1.svc file and a code behind file Service1.svc.cs

In my project I have renamed those as IDataService.cs, DataService.svc and DataService.svc.cs accordingly. To change the markup file of DataService.svc right click on the DataService.svc file in solution explorer and press "View Markup" as bellow

and change the Service according to you code as bellow.

<%@ ServiceHost Language="C#" Debug="true" Service="TestWCFService.DataService" CodeBehind="DataService.svc.cs" %>

In the solution my IDataSevice.cs is as bellow:

using System.Runtime.Serialization;
using System.ServiceModel;

namespace TestWCFService
{
    
    [ServiceContract]
    public interface IDataService
    {

        [OperationContract]
        UserInformation GetUserDataFromService();

        [OperationContract]
        string GetUserRestrictionFromService(string userID);
        
        // TODO: Add your service operations here
    }


    // Use a data contract as illustrated in the sample below to add composite types to service operations.
    [DataContract]
    public class UserInformation
    {

        [DataMember]
        public string UserName { get; set; }

        [DataMember]
        public string UserLocation { get; set; }

      
        public string UserRestriction(int userID)
        {
            if (userID.Equals(1))
                return "approve";
            else
                return "rejected";
        }
       
    }
}

My DataService.svc.cs file is as bellow :

using System;

namespace TestWCFService
{
    // NOTE: If you change the class name "Service1" here, you must also update the reference to "Service1" in Web.config and in the associated .svc file.
    public class DataService : IDataService
    {
        #region IDataService Members

        public UserInformation GetUserDataFromService()
        {
            return new UserInformation() { UserName = "Tanvir", UserLocation = "Dhaka" };
        }

        public string GetUserRestrictionFromService(string userID)
        {

            UserInformation userInformation = new UserInformation();

            if (userInformation.UserRestriction(Int32.Parse(userID)).Equals("approve"))
                return String.Format("your user id is {0} and you are approved", userID);
            else
                return String.Format("your user id is {0} and you are not approved", userID);

        }

        #endregion
    }
}

And the most important thing is to change in system.servieModel section in Web.config file as bellow :

<system.serviceModel>
        <services>
            <service name="TestWCFService.DataService" behaviorConfiguration="TestWCFService.Service1Behavior">
                <!-- Service Endpoints -->
                <endpoint address="" binding="wsHttpBinding" contract="TestWCFService.IDataService">
                    <!-- 
              Upon deployment, the following identity element should be removed or replaced to reflect the 
              identity under which the deployed service runs.  If removed, WCF will infer an appropriate identity 
              automatically.
          -->
                    <identity>
                        <dns value="localhost"/>
                    </identity>
                </endpoint>
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <behavior name="TestWCFService.Service1Behavior">
                    <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
                    <serviceMetadata httpGetEnabled="true"/>
                    <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
                    <serviceDebug includeExceptionDetailInFaults="false"/>
                </behavior>
            </serviceBehaviors>
        </behaviors>
    </system.serviceModel>

We have to change the underline and bold section up above according to you code and naming in our solution.

Thanks

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

Custom Event in .NET

2009-02-25T16:14:00.000+06:00

Hello All,

Today I will try to deliberate my experience on custom event creation in .NET , Actually I was trying to find something like hands on for event creation in .NET application, suddenly I got a quick help from one of my brother Sadique, who helped me out to resolve the thirst.

We are going to create a custom control where we will define our event class and event handler.To do that first take a user control named InputControl.ascx . The ascx page is as bellow.

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="InputControl.ascx.cs" Inherits="InputControl" %>
<asp:Label ID="lblLabel" runat="server" Text=""></asp:Label>
    <br />
<asp:TextBox ID="txtTextBox" runat="server"></asp:TextBox>
    <br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" 
    onclick="btnSubmit_Click" />

In that page I put a textbox control to take input , a button control to fire our custom event handler and a label to show our input result through our custom event.

The InputControl.ascx.cs code behind file is as bellow :

using System;

public partial class InputControl : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    public string EventInputBox
    {
        get {
                return this.txtTextBox.Text;
            }
        set {
                this.txtTextBox.Text = value;
            }
    }

    public string EventLabel {
        get {
                 return this.lblLabel.Text;
            }
        set {
                 this.lblLabel.Text = value;
            }
    }

    public event EventHandler<CustomEventArgs> CustomEventSubmit;
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        if (this.CustomEventSubmit != null)
            this.CustomEventSubmit(this, new CustomEventArgs("your text is:" + EventInputBox));
    }

}

public class CustomEventArgs : EventArgs
{
    public string EventText { set; get; }

    public CustomEventArgs(string eventTextData)
    {
        EventText = eventTextData;

       
        /*
         Perform other event tasks.
         
         */
    }
}

Now I register the control in my Default.aspx page as bellow .

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<%@ Register src="InputControl.ascx" tagname="InputControl" tagprefix="uc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <uc1:InputControl ID="icEventBox" runat="server" OnCustomEventSubmit="icEventBox_CustomEventSubmit"  />
    </div>
    </form>
</body>
</html>

In the file above we have to focus on OnCustomEventSubmit="icEventBox_CustomEventSubmit" which is pointing our custom event.

The code behind file Default.aspx.cs is as bellow.

using System;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void icEventBox_CustomEventSubmit(object sender, CustomEventArgs e)
    {
        icEventBox.EventLabel = e.EventText;
    }
}

In the above article I didn't go for much brief discussion , I think the code is sufficient to describe a custom event itself.

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

Namespace in ASP.NET

2008-12-29T12:26:00.001+06:00

Commonly Used Types and Namespaces in ASP.NET

System.Web
HttpApplication
HttpCookie
HttpRequest
HttpResponse
HttpRuntime
HttpServerUtility

System.Web.ApplicationServices *NEW
AuthenticationService NEW
ProfileService NEW
RoleService NEW

System.Web.Caching
Cache

System.Web.ClientServices *NEW
ClientFormsIdentity NEW
ClientRolePrincipal NEW
ConnectivityStatus NEW

System.Web.ClientServices.Providers *NEW
ClientFormsAuthenticationMembershipProvider NEW
ClientRoleProvider NEW

System.Web.Compilation
BuildProvider

System.Web.Configuration
WebConfigurationManager *NEW

System.Web.Hosting
ApplicationManager

System.Web.Management
WebBasedEvent

System.Web.Security
FormsAuthentication
FormsIdentity
Membership
Roles

System.Web.SessionState
HttpSessionState

System.Web.UI
Control
MasterPage
Page
ScriptManager NEW
System.Web.UI
UpdatePanel NEW
UpdateProgress NEW
UserControl

System.Web.UI.HtmlControls
HtmlButton
HtmlControl
HtmlForm
HtmlInputControl

System.Web.UI.WebControls
Content
DetailsView
FormView
GridView
LinqDataSource
ListView
LogIn
Menu
ObjectDataSources
TreeView
Wizard

System.Web.UI.WebControls.WebParts
WebPart

*New - New namespaces in .NET framework 3.5

[Source]

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

MySQL multiple table update & Regular Expression

2008-12-05T15:15:00.000+06:00

Hello all

Though its a very simple process but we usually don't do this stuff too much unless we are bound to do that.In this article I will show how to update a table data with another table depending on another table & another will be a simple regular expression in MySQL query.

In the example I have 'new_users' table to update with the data of 'listings' table depending on the condition or 'users' table. and the table structure is as bellow.

'new_users' :
userID,phone,user_state
'listings' :
listID,userID,phone
'users':
countID,userID,category

Now the scenario is I have to update the phone of new_users from the listings tables phone of same userID but only who are only 'Admin' which we may found in users table's category field. So the query will be as following

-- Update from listings for 'Admin'
update listings, new_users, users
set
new_users.phone = listings.phone 
where
users.category = 'Admin' &&
listings.userID = users.userID &&
users.userID = new_users.userID

Now come to the second part, we can apply regular expression in our MySQL query as follow:

-- Update all user_state to null which contains invalid character
update new_users
set
new_users.user_state = null
where
new_users.user_state REGEXP '[1234567890~!@#$%^&*()_+|}{":?><,./;]'

The query will set null to user_state field if user_state field contains none but a-z & A-Z previously.

I have also some collection or regular expression for MySQL which i have collected from different site.

A very simple example illustrating this is to select all the records from MyTable for which MyField starts with "A"

SELECT * FROM MyTable WHERE MyField REGEXP '^a';
Please take a look to the list below in order to find more information for the available options MySQL Regular Expressions
*
Matches zero or more instances of the string preceding it
+
Matches one or more instances of the string preceding it
?
Matches zero or one instances of the string preceding it
.
Matches any single character
[xyz]
Matches any of x, y, or z (the characters within the brackets)
[A-Z]
Matches any uppercase letter
[a-z]
Matches any lowercase letter
[0-9]
Matches any digit
^
Anchors the match from the beginning
$
Anchors the match to the end
|
Separates strings in the regular expression
{n,m}
String must occur at least n times, but no more than n
{n}
String must occur exactly n times
{n,|
String must occur at least n times

[Source]

That's all for the day.
BYE

User ScrumPad for your Agile based projects.

Isolated Unit Test of Business Logic With NMock in TDD

2008-11-28T12:35:00.001+06:00

Hello All

In test driven development its always needed to test a particular project tested with make it isolate ( test with removing dependency from other projects ), In this scenario we virtually create the input set which will be produced from other projects(class,methods etc) and test whether our testable methods are functioning with that input set or not.

To do that we have to make mock of the dependent objects. In the example bellow I have shown how to test a business logic layer with isolating it from data access layer.I have created three projects Web.Data , Web.Core & BL.Test .

The Web.Data project contains the Data Access Layer which will be responsible for pulling data from the data source,but as we are isolating our business logic layer from this project so in the example I will not completely implement our desired method( as it will not be executed).

To do that we need some tools such as NMock and NUnit . We will found the NMock.dll , nunit.core & nunit.framework in both of its bin folder where we extract or install those.

our Web.Data contains only two files one is IMockDAL.cs interface and MockDAL.cs class.

IMockDAL.cs interface :

using System.Collections.Generic;

namespace Web.Data
{
   public interface IMockDAL
    {
       /* The method will return a string list of
        * active member's name from data source .
        */
        List<string> GetNameListDAL(bool active);
    }
}

MockDAL.cs Class :

using System;
using System.Collections.Generic;

namespace Web.Data
{
    public class MockDAL:IMockDAL
    {
        #region IMockDAL Members

        /* This method will not be executed during the test,
         * as we will do mock of this method.         
         */
       public List<string> GetNameListDAL(bool active)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}

In our Web.Core there are also two files , one is IEmployeeService.cs interface & EmployeeService.cs the class file. in this project we have to add reference of Web.Data project as it has a dependency over that.
IEmployeeService.cs interface :

using System.Collections.Generic;
using Web.Data;

namespace Web.Core
{
   public interface IEmployeeService
    {
        IMockDAL MockDAL { set; get; }
        List<string> GetAllEmployee();
    }
}

EmployeeService.cs Class :

using System.Collections.Generic;
using Web.Data;

namespace Web.Core
{
   public class EmployeeService : IEmployeeService
    {
        /* The MockDAL property will be used to assign
         * DAL through our mock object.
         */
        public IMockDAL MockDAL { set; get; }

        public EmployeeService()
        {
            MockDAL = new MockDAL();        
        }

        #region IEmployeeService Members

        /* The "GetAllEmploye" will call the "GetNameListDAL"
         * from the mock object. For the sake of simplicity 
         * I just call the DAL,not did any other operation.
        */

        public List<string> GetAllEmployee()
        {
            return MockDAL.GetNameListDAL(true);
        }

        #endregion
    }
}

In BL.Test project we have to add some reference as it have dependency over couple of projects and DLLs . We have to add reference of Web.Data & Web.Core and we also have to add NMock.dll , nunit.core & nunit.framework .In this project we have a class file named MockTest.cs

using System.Collections.Generic;
using NMock2;
using NUnit.Framework;
using Web.Data;
using Web.Core;

namespace BL.Test
{
    [TestFixture]
    public class MockTest
    {
        /* Assign property of our object that will be executed.
         */
        public Mockery _mock;
        public IMockDAL _mockDAL;
        public IEmployeeService _employeeService; 

        [SetUp]
        public void init()
        {
            /* initializing our objects.
             */
            _mock = new Mockery();
            _mockDAL = _mock.NewMock<IMockDAL>();
            _employeeService = new EmployeeService();
            _employeeService.MockDAL = _mockDAL;

        }

        [Test]
        public void TestEmployeeCount()
        {
            /* In the list bellow we are creating our virtual list of
             * string, which we are expecting after calling the DAL
             * this list will be returned.
             */
            List<string> employeeList = new List<string>();
            string emp = "Maix";
            string emp2 = "Pain";
            employeeList.Add(emp);
            employeeList.Add(emp2);


            /* _mockDAL -> is our mocked DAL object.
             * GetNameListDAL -> is one of the method name of the _mockDAL object.
             * With(true) -> the single boolean parameter of the GetNameListDAL method.
             * employeeList -> The expecter return value from the GetNameListDAL method.
             */
            Expect.Once.On(_mockDAL).Method("GetNameListDAL").With(true).Will( Return.Value(employeeList));

            List<string> employeeListResult = _employeeService.GetAllEmployee();

            /* Verify the mock object is executed successfully with its expectation.
             */
            _mock.VerifyAllExpectationsHaveBeenMet();

            Assert.AreNotEqual(null, employeeListResult);
        }
    }
}

To make it run we can set the project as our startup project and configure the NUnit .

That's all for the day.

BYE

User ScrumPad for your Agile based projects.

UI test with WatiN for TDD in .NET

2008-11-21T16:06:00.000+06:00

Hello all

Today I will show how to test UI ( User Interfaces ) in .NET with WatiN . WatiN is UI test framework. Though its a very simple but i have felt the documentation is not rich enough with example. So i have taken an initiative to make it more userfriendly for the developers.

I will not emphasize on how to configure WatiN as its already well documented in the following links. What i will try to do is make familiar with HTML controls that's needed to be validated .

Follow accordingly to configure WatiN :

Add reference as the documentation of WatiN, you dont have to follow the example which is documented there just add the reference.
If you don't know how to add reference please see this and for NUnit see this.
Visit this link for a good CodeProject's example.

One of the common mistake we do is, open a class file in our website project and start the writing the test code in it, but what we have to do is make a new Class Project ,add reference in that project & select as startup project for NUnit test.

using WatiN.Core;
using NUnit.Framework;
using WatiN.Core.DialogHandlers;

namespace TestStie
{
  [TestFixture]
  public class AddArticleTest
    {

      [TestFixtureSetUpAttribute]
        public void SetUp()
        { 
        }

       [Test]
        public void TestAddArticle()
        {
            using (IE ie = new IE("http://localhost:2456/testsite/login.aspx"))
            {

                /*
                 * For textbox and textarea we have to use TextField() method and to search by 
                 * id of the control we have to use Find.ById() method & to fill the textbox 
                 * we have to use TypeText() method as following.                 
                 */

                ie.TextField(Find.ById("ctl00_UserName")).TypeText("maxpain");
                ie.TextField(Find.ById("ctl00_Password")).TypeText("c0de71~123");
               
                /*
                 * For make a check box cheked we have to do as following.                 
                 */
                ie.CheckBox(Find.ById("ctl00_chkActive")).Checked = true;
                
                /*
                 * To upload a file we have to do as bellow.
                 */
                ie.FileUpload(Find.ById("ctl00_LogoFile")).Set(@"C:\calligraphy.jpg");

                /*
                 * To selct a value form a dropdown list we have to follow as bellow.
                 * In the exmaple "Software Engineer" is selected item's value.
                 */
                ie.SelectList("ctl00_BodyPlaceHolder_ddlSkillCategory").Select("Software Engineer");

                /*
                 * For make a radio button cheked we have to do as following.                 
                 */
                ie.RadioButton(Find.ByName("ctl00$BodyPlaceHolder$rbPublish")).Checked = true;

                /*
                 * To click a link we have to do as bello
                 */
                ie.Link(Find.ByUrl("http://localhost:2456/testsite/AddArticle.aspx?id=3")).Click();

                /*
                 * To click a button we have to do as bellow.
                 */
                ie.Button(Find.ById("ctl00_LoginButton")).Click();

                /*
                 * Suppose we have to make confirm a delect action through JS confirmation box when we click 
                 * a link, then we have to do as follow.
                 */
                AlertDialogHandler alertDialogHandler = new AlertDialogHandler();
                ConfirmDialogHandler confirm = new ConfirmDialogHandler();
                using (new UseDialogOnce(ie.DialogWatcher, confirm))
                {
                    Link link = ie.Link(Find.ByUrl("http://localhost:2456/testsite/AllCaseStudy.aspx?id=5"));

                    link.ClickNoWait();
                    confirm.WaitUntilExists();
                    confirm.OKButton.Click();
                }
                ie.WaitForComplete();

                /*
                 * Now to check whether our operatin is successful or not we have to do assert test 
                 * as we do in unit test. Here ContainsText("xxxx") method returns true when it found
                 * the "xxxx" string in the page appear after any event perform.(generally we show
                 * a confirmation message after any successful event performed.) 
                 */
                Assert.IsTrue(ie.ContainsText("News Deleted successfuly"), "Deleted id not found.");
            }         
        }

        [TestFixtureTearDownAttribute]
        public void TearDown()
        {
        }
    }
}

Thats all for today.

BYE

User ScrumPad for your Agile based projects.

ASP.NET Form Authentication

2008-11-05T00:02:00.000+06:00

Hello All

Today I will demonstrate how to do Form based authentication manually.Though it can be maintained through login controls which is provided by Visual Studio but sometime we need to do the task without using those controls and the required database.

First we have to perform validation for the user, then we needed to authenticate the user for different type of task according to the role of the user ( I will do role based authentication.) In my example I have a folder named "Secure" which can be access only by the Admin user. (in the following code I assume that U have done the validation for a user.)

/* we are taking expire time duration form application settings file you may also hard coded this value.*/

double EXPIRETIMELIMIT = Convert.ToDouble(ConfigurationManager.AppSettings["EXPIRETIMELIMIT"]);

  FormsAuthentication.Initialize();
  FormsAuthentication.HashPasswordForStoringInConfigFile("password", "md5");
            
  StringBuilder roles = newStringBuilder();
  /* bellow i have added 2 roles , you may add roles according to your logic.*/
  roles.Append("Admin");
  roles.Append("Manager");
               
  FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, "User Name", DateTime.Now, DateTime.Now.AddMinutes(EXPIRETIMELIMIT), true, roles.ToString(), FormsAuthentication.FormsCookiePath);         
  string hash = FormsAuthentication.Encrypt(ticket);      
  HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, hash);
/*We have to set the cookie expire time manually,its not working which we set in the parameter  of the FormsAuthenticationTicket's constructor .*/
 cookie.Expires = DateTime.Now.AddMinutes(EXPIRETIMELIMIT); 

 if(ticket.IsPersistent)
    cookie.Expires = ticket.Expiration;

 Response.Cookies.Add(cookie);

 Response.Redirect("Admin/Home.aspx");

Now open the the Global.asax file,if its not exist in your current solution add it as a new item. Then add the following code block as bellow,which will chek the authentication in each page request.

protected void Application_AuthenticateRequest(Object sender, EventArgs e)
   {
       if (HttpContext.Current.User != null)
       {
           if (HttpContext.Current.User.Identity.IsAuthenticated)
           {
               if (HttpContext.Current.User.Identity is FormsIdentity)
               {
                   FormsIdentity identity = (FormsIdentity)HttpContext.Current.User.Identity;

                   FormsAuthenticationTicket ticket = identity.Ticket;

//         UserData is the roles which we have assigned before.
                   string[] roles = ticket.UserData.Split(new Char[] {','});
                                     
                   HttpContext.Current.User = new System.Security.Principal.GenericPrincipal(identity, roles);
                   
               }            
           }        
       }    
   }

Now its the time to securing our folder from web.config . When any Authorized user will try to access in the Admin folder then this will check the "Admin" role for the user.

<authentication mode="Forms">
        <forms name="MYWEBAPP.ASPXAUTH"  loginUrl="TeleMarketerLogin.aspx" protection="All" path="/"/>  
    </authentication>
    <authorization>
        <deny users="?"/>
        <allow roles="Manager,Admin"/>
        <deny users="*"/>
    </authorization>

<location path="Secure">
    <system.web>
        <authorization>
        <deny users="?"/>
        <allow roles="Admin"/>
        <deny users="*"/>
        </authorization>
    </system.web>
</location>

<location path="App_Themes">
    <system.web>
        <authorization>
            <allow users="*"/>
        </authorization>
    </system.web>
</location>

thats all for today.
BYE

User ScrumPad for your Agile based projects.

Web service creation & consuming with ASP.NET

2008-10-22T21:07:00.000+06:00

Hello all

Today I will show how to create web service with VS2008 and consume it in different application.
first I have opened a web service from File>New web site > web service named "DemoWebService".

now in the solution explorer we can a Service.asmx file and the Service.cs file in App_Code . I have added another web service named WebServiceTest.asmx so a WebServiceTest.cs file also added in App_Code folder.

we will basically work with *.cs file to make the service.
I opened the WebServiceTest.cs file and there is a demo web method named Hello World. So I will create another method named "GetValue" which will also return a string.

using System;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
/// <summary>
/// Summary description for WebServiceTest
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]
public class WebServiceTest : System.Web.Services.WebService {
public WebServiceTest () {
//Uncomment the following line if using designed components 
//InitializeComponent(); 
 }
[WebMethod]
public string HelloWorld() {
return "Hello World";
    }
[WebMethod]
    public string GetValue()
{ 
string valueString = "the result of your logic.";
return valueString;
}
}

We have to add the [WebMethod] attribute before starting any method which will serve the web service.

Now i will add another web site named "ConsumeWebService" which will be used to consume the web service. and add web reference to the site as bellow.

for the simplicity I have chosen the Web service in this solution( you can choose you own type as you needed for the further use).
now we will see our Class file which we have created in our web service, I have select the WebServiceTest for the implementing.

Now we will sell our methods in the next window, now I have selected the web reference name as "WebserviceTest" and add the reference .

for the simplicity I will skip the discussion of *.disco & *.wsdl file,this file are basically needed for communication between our application and web service.

now I open the Default.aspx.cs file and add the WebServiceTest namespace and call the Method of web service as following.

no compile the web site and and enjoy the service.

BYE

Captcha generate with ASP.NET & C#

2008-10-21T22:42:00.000+06:00

Hello all

Today I will demonstrate how to generate captcha with asp.net & C# . though there are many .NET plugin and controls to serve the purpose but my focus is to generate the a random image and its manipulation with the help of .NET framework.

First open a web project and add a "Web user control" , in the example the name of my control is "ImageGeneratorControl.ascx" . the purpose of the control is to generate a image according to the random character.

Now open the "ImageGeneratorControl.ascx.cs" file (i used the code behind method for the example.) , to generate image we have to use System.Drawing base class.

firstly we have to make a Bitmap type object where the image will generate, then for the texture we have to take a Graphics type object and manipulate the our random string there, after that we will sat the content type and save the Bitmap object stream so that it may generate a image file, finally we have to dispose our objects.

there is a method named "RandomString" which will take the length of sting to be generate as parameter, in the method i have generate a random number and convert the number into string.In an addition the string will be save in Session.

The code of the "ImageGeneratorControl.ascx.cs" is as bellow :

using System;
using System.Drawing;

public partial class ImageGeneratorControl : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Bitmap objBmp = new Bitmap(100, 30);
        Graphics objGraphics ;
        Font objFont = new Font("Arial", 16, FontStyle.Bold);

objGraphics = Graphics.FromImage(objBmp);
objGraphics.Clear(Color.WhiteSmoke);

objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
objGraphics.DrawString(this.RandomString(6), objFont, Brushes.Gray, 3, 3);

Response.ContentType = "image/GIF";
objBmp.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);

        objBmp.Dispose();
        objGraphics.Dispose();
        objFont.Dispose();
    }

    private string RandomString(int length)
    {
        Random rand = new Random();
        char ch;

System.Text.StringBuilder randString = new System.Text.StringBuilder();

        for(int i = 0 ; i<length; i++)
        {
            ch = Convert.ToChar(Convert.ToInt32((Math.Floor(rand.NextDouble() * 26) + 65)));
            randString.Append(ch);
        }
        Session["CaptchaString"] = randString.ToString().ToLower();
        return randString.ToString().ToLower();
    }
}

now we have to place that control in a aspx page (we also can handle it with HTTPHandler but for the simplicity i have used a aspx page which will act as a "GIF" image)

so i have taken a Image.aspx file and register the Control as following:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Image.aspx.cs" Inherits="_Image" %>

<%@ Register src="ImageGeneratorControl.ascx" tagname="ImageGeneratorControl" tagprefix="uc1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>
<body>
    <form id="form1" runat="server">
      <uc1:ImageGeneratorControl ID="ImageGeneratorControl1" runat="server" />
    </form>
</body>

Now this Image.aspx file will act as a Image . What we have to do now is include the Image.aspx page in our main aspx file where the image will be visible. i have used Container.aspx file to generate the captcha as following:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Container.aspx.cs" Inherits="Container" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Captcha Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div><img src="Image.aspx" /></div>
    </form>
</body>
</html>

now you can protect the form from spamming according to your logic,session and image data.

BYE

Simple unit test with NUnit

2008-09-19T23:03:00.000+06:00

Hello all

Today I will show you how to do unit test of a .NET project with NUnit. NUnit is a great tool to do unit test of any .NET project.As its a third party tool so you have to download it from here . I assume that you all are familiar with unit test.For the simplicity I will show you a simple example,Once when you are habituated with this took you will find yourself in many complex test script.

first I opened an new class project named Calculation.Core.

then I added two method which will be tested through NUnit.

The class file's is "Calculation" and those two methods are DoAdd & DoSub which will add two numbers and subtract two numbers.Both's return type and parameters type are integer .

namespace Calculation.Core
{
    public class Calculation
   {

        public int DoAdd(int firstNumber, int secondNumber)
        {
            return firstNumber + secondNumber;
        }

        public int DoSub(int firstNumber, int secondNumber)
        {
            return firstNumber - secondNumber;
        }
    }
}

now I added another class project named Calculation.Test and Add Reference of the Calculation.Core project. and also make Add DLL Reference of NUnit's "nunit.framework.dll" from my NUnit's installed location "C:\Program Files (x86)\NUnit 2.4.8\bin\nunit.framework.dll" .This will vary according to your installation of NUnit.

now I have to include namespace in the file by typing :

using NUnit.Framework;

now we have to add the "[TestFixture]" attribute to the CalculationTest class and "[Test]" attribute to the DoAddTest ,DoFailTest & DoSubTest methods.

using NUnit.Framework;
namespace Calculation.Test
{
   [TestFixture]
    public class CalculationTest
    {
       [Test]
       public void DoAddTest()
       {
           
           Calculation.Core.Calculation sub = new  Calculation.Core.Calculation();
           int result = sub.DoSub(3,1);
           Assert.Greater(3, result);
       }

       [Test]
       public void DoSubTest()
       {
           Calculation.Core.Calculation sub = new Calculation.Core.Calculation();
           int result = sub.DoSub(3, 1);
           Assert.Greater(3, result);
       }

       [Test]
       public void DoFailTest()
       {
           Calculation.Core.Calculation sub = new Calculation.Core.Calculation();
           int result = sub.DoSub(3, 1);
           Assert.Greater(1, result);
       }
    }
}

Now we have to select the Calculation.Test project as Starup project and select the "Properties" from the Solution Explorer .

Now form the Calculation.Test tab we have to select Debug then select Start External Program and set the location of NUnit.exe then select Command line argument and write the dll name of the test project .

now when we will run the application then NUnit will automatically start and we have to press run button to show the unit test result.

In the result we will see that the two method of our test script has passed but one fail as I didn't give the proper assert method .

in this way we can do unit test with NUnit. There are also many useful method of NUnit's to test the script.
BYE

Simple C# coding standard

2008-08-27T07:56:00.001+06:00

Hello All

To day I will go through about coding standard which we must have to follow during development .

1.Pascal casing should have to follow in Class & Method naming

example : public class TestClass{}; public void TestMethod(){};

2.Camel casing should have to follow in writing and local variable and parameter.

example : int localCounter;public void TestMethod(int counter){};

3. "_" should have to given while starting a private variable

example : private string _localAddress;

4. "I" character should have to place before the name of any interface.

example: interface IDataCollection{};

there are some vital information about coding standard here .

Bye

Simple Web Application Installer with VS2008

2008-08-22T23:19:00.000+06:00

Hello all.

Today I will show how simple it is to make a web application installer with Visual Studio.

I have assumed that you have a project already open and now you want to make a installer for it.

First we have to add a new project from File->Add->New Project

Then we have to select

Other Project Type->Setup & Deploy -> web setup project

I name it "WebSetupProject" . In Solution Explorer we will found that installer project.

Now we have to right click over the "WebSetupProject" and click on Bulild.

Our basic task is complete now we will get the installer in a the project's debug folder as bellow.

Bye.

Simple Excel Data read and save with C#.NET

2008-08-09T12:22:00.000+06:00

Hello All

Today i will demonstrate the process of Excel data read with both DataReader & DataSet . Though the Code is not optimize but its very simple to read a excel file in OLEDB.

In the example i have hard-coded the Excel file location named "Book1.xls", and the selected sheet is "Sheet1". We also have a database and a table in it named "TableInfo" where we will insert data after reading from excel file.

using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.OleDb;
using System.Collections;

namespace ExcelExport
{
    class GenerateExcel
    {
        public ArrayList ColumnNames;

        public DataSet ReadExcell()
        {
            String conStr = "Provider=Microsoft.Jet.OLEDB.4.0;" + @"Data Source=C:\Documents and Settings\tanowar\Desktop\Excel\WinApp\ExcelExport\ExcelExport\Book1.xls;" + "Extended Properties=Excel 8.0;";
            string sqlConString = "Data Source=DtaBase;Initial Catalog=GPXPO;User ID=User;Password=XXX ";

            SqlConnection sqlCon = new SqlConnection(sqlConString);          

            OleDbConnection oleCon = new OleDbConnection(conStr);
            DataSet ds = new DataSet();

            try
            {
                #region DataSet

                oleCon.Open();                
                OleDbCommand oleCmd = new OleDbCommand("select * from [Sheet1$]", oleCon);

                OleDbDataAdapter oleAd = new OleDbDataAdapter();
                oleAd.SelectCommand = oleCmd;
                oleAd.Fill(ds);
                oleCon.Close();

                #endregion


                #region DataReader

                OleDbDataReader reader = oleCmd.ExecuteReader();
                while (reader.Read())
                {
                    sqlCon.Open();                    
                    SqlCommand sqlCmd = new SqlCommand("insert into TableInfo (AllotNo,BankCode,LotteryNo,BONo,Name,Shares)values('"+reader[0].ToString() +"','"+reader[1].ToString() +"','"+reader[2].ToString() +"','"+reader[3].ToString() +"','"+reader[4].ToString() +"',"+reader[5].ToString() +")",sqlCon);
                    sqlCmd.ExecuteNonQuery();
                    sqlCon.Close();
                }
               #endregion

            }
            catch (Exception exc)
            {
                exc.ToString();                
            }
            return ds;
        }
    }
}

Simple .NET Cookie Management

2008-07-24T22:18:00.000+06:00

Hello all

Today I will give a short description about using Cookie with .NET , Cookie is one of the most impotent thing to maintain scalability of server as well as manipulation user's information easier. Generally a Cookie enabled browser can store about 20 cookies for a single domain , so what's happen ;when you try to keep more cookie in a browser for a particular domain it discard the oldest cookie. If you don't set the expiration of a Cooke it will remain in memory till the browser session , when you close browser then the cookie is also expire , but when the expiration is set the the cookie is saved in hard drive.

We can manipulate the cookie in two ways as bellow.

// First Example
 Response.Cookies["index"].Value = "test value first";
 Response.Cookies["index"].Expires = DateTime.Now.AddDays(1);

// Second example
HttpCookie httpCookie = new HttpCookie("NewCookie");
httpCookie.Value = "tast value second";
httpCookie.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(httpCookie);

To retrieve the Cookies information we have to do as following . But one thing we all should have to remember that each and ever time when we try to retrieve data from cookie we have to check that the cookie is no "null". If the cookie is null and we want to retrieve data from that cookie it will through an exception.

// First Example
if (Request.Cookies["index"] != null)
    Response.Write(Request.Cookies["index"].Value.ToString());
else
    Response.Write("Cookie not set.");

// Second example
if (Request.Cookies["NewCookie"] != null)
    Response.Write(Request.Cookies["NewCookie"].Value.ToString());
else
    Response.Write("Second Cookie not set.");

That's all for today .

BYE

Easy dll using in Visual Studio

2008-07-18T00:04:00.001+06:00

Hello again

Today I will show how to use a .dll file using Visual Studio. dll is nothing but the a complied managed code by .NET CLR (at least for this tutorial).

what I did is just wrote a simple class "Employee" in a new project named "EmployeeInformation". It has one property and a method jest to show that how to build a dll of a class and use it in another project.

Now i have build the class by right clicking over the project named "EmployeeInformation" and pressing build, For me a dll has been generated in "C:\Users\MD.Tanvir Anowar\Documents\Visual Studio 2008\Projects\RefTest\EmployeeInformation\bin\Debug\" directory named "EmployeeInformation.dll" you may found it in your Output panel at the bellow of VS after build the project.

Now I have to let the dll know by my main project "RefTest", to do this i have to right click on my "RefTest" project and Click over Add Reference .

Now i have to browse and select the "EmployeeInformation.dll"

to user the dll now we have to instantiate the class in our main porject's class by typing:

EmployeeInformation.Employee employee = new EmployeeInformation.Employee();

now in employee object we will get the our desire property of the class as following

Thank you.

Simple multiple projects add to Visual Studio

2008-07-13T18:14:00.000+06:00

Hello all

Today I will explain how to add multiple project in Visual Studio .(That could be use for n-tier architecture or for other purpose). In .NET or in any language its wanted to fragment individual module of a system should have to be separated. In .NET we do this by adding multiple project in a single solution.

First open a new project ( in the example I have used new website named Emp ).

now add a new project from File > Add > New Project ( which will be a layer of Emp Website)

and then select Windows > > Class Library and give a name in the example I have named "DataAccessLayer".

The initial task has been completed. Now in you solution explorer you will find new project named "DataAccessLayer" and a default class named Class1.cs which you can rename according to your naming convention.

Now the most vital thing to do is let our main website "Emp" be referenced with the "DataAccessLayer" project ,otherwise we will not be able to use the resource of "DataAccessLayer" in "Emp" !

To do that we have to select out website "Emp" and right click on it after that we have to select Add Reference .

After a short time a window will came named Add Reference, from there we have to select the Project tab and let select the desired project for us its "DataAccessLayer" then click ok.

the task is done now we will be able to use the "DataAccessLayer" project's resource from our "Emp" website .

There is little additional task to do ..

We have to define the name of the project

"using DataAccessLayer;" at the top of the classes which will use the resource of the "DataAccessLayer" as following.

that's all for today

Bye

Simple XML parsing with XPath

2008-07-12T17:27:00.002+06:00

Hello again. Today i will talk about how to purse XML simply with .NET's XPath features.We know XML now days gets very important thing for transferring or what ever. I will show how simply we can Purse a XML file. Suppose we have a XML file named "Sample.xml" and the structure of that XML file is as bellow:

   1:  <?xml version="1.0" encoding="utf-8" ?>

   2:  <items>

   3:    <item>

   4:      <name>Tanvir</name>

   5:      <id>03-04304-3</id>

   6:    </item>

   7:    <item>

   8:      <name>Anowar</name>

   9:      <id>04-04304-2</id>

  10:    </item>

  11:  </items>

now open a Default.aspx page and import the sub class Xml,and Xml.XPath by writing as bellow:

   1:  using System.Xml;

   2:  using System.Xml.XPath;

Now making a XPathDocument document we can iterate our queries as given in nav.Select("/items/item/name") . here /items/item/name is our query ,where Items is the root node . item is the child node and name is our desired node which is going to be explored.
The following code is in C#.NET for exploring XML node with XPath.

 XPathDocument xmlDoc = new XPathDocument(MapPath("Sample.xml"));

 XPathNavigator nav = xmlDoc.CreateNavigator();

 XPathNodeIterator iterate = nav.Select("/items/item/name");

 while(iterate.MoveNext())

    Response.Write(iterate.Current.Name); // print the node name

    Response.Write("&nbsp");

    Response.Write(iterate.Current.Value); // print the value

    Response.Write("<br />");

Simple Mail send Through .NET

2008-07-12T17:17:00.001+06:00

Hello all ,
Today i will describe how to send mail through .NET
First we have to configure the SMTP mail server . In this context i have assumed you mail server has been configured (including web.config ).
Now we have to import

using System.Net;

using System.Net.Mail;

And through the following code we will able to send mail with attachment.

MailMessage msg = new MailMessage();

msg.From = new MailAddress("mail@test.com");

msg.To.Add(new MailAddress("mail_1@test.com"));

msg.To.Add(new MailAddress("mail_2@test.com"));

msg.CC.Add(new MailAddress("mail_3@test.com"));

msg.Bcc.Add(new MailAddress("mail_4@test.com"));

msg.Attachments.Add(new Attachment(@"c:\file.txt"));

msg.Subject = "This is a test mail";

msg.Body = "This is the body of the mail";

SmtpClient client = new SmtpClient();

client.Send(msg);

Event fire at certain time.

2008-07-05T20:23:00.001+06:00

(This article is taken from one of my other blog.) from few days one thing is clicking in my head very simple but not initiated before.so i have posted the problem in phpfreaks forum and got some useful solutions : #1 : hi i want to know how to run continuous service which is written in php? for example : i want to inform through email to my clients in a particular time automatically , how to do it ? Thanking you Tanvir.

=> Cron job.

# 2 : but there is one question more, if i use corn job then i must have access to modify the etc/corntab in any linux server, generally when we hosting a site then we dont have the permission to modify any server scripts like corntab unless its a dedicated server. is there any other solution to do the job avoiding this problem? =>If you don't have access to the crontab, then you most certainly won't have access to the init scripts required to run a service. => ot entirely true. On many 'shared' hosting plans that use stuff like cpanel, they will allow you to set up your own cron jobs. Fairly easily too. =>if not many people provide external crontab access so that you can have a psedo cron tab by having another server ping your cron job page. they might cost you a monthly fee, but it be better than switching hosting companies

Easy Northwind Database installation.

2008-07-05T18:09:00.000+06:00

Its pretty much needed to work with a existing relational database to test any new features of a language,but its really tough to get it at the right moment. We can easily get one from Microsoft's Northwind database.First we have to install SQL Server Management Studio and then download the sample database form here . After installing the SampleDB, it will create a directory named "C:\SQL Server 2000 Sample Databases" . In this Database we will get some files including NORTHWND.MDF.To use it, first we have some inital tasks to do ... 1. In the first step we have to double click on "instnwnd.sql" which is in the "C:\SQL Server 2000 Sample Databases" folder , after click SQL Server Management Studio will automaticly open then we have to press the "Execute" button. 2. In the similar way we also wave to double click on "instpubs.sql" and do the same thing. after that when we connect our SQL server we foud our desired NORTHWIND database . in the above topic i have escaped many vital technical issues just to make the article simple any easy to read as well as easy to impliment. hope it will work. have a nice day.

LINK Exchange

2008-06-24T09:24:00.000+06:00

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