We all know about Ternary operator in C#.NET. I am a big fan of ternary operator and I like to use it instead of using IF..Else. Those who don’t know about ternary operator please go through below link.

http://msdn.microsoft.com/en-us/library/ty67wk28(v=vs.80).aspx

Here you can see ternary operator returns one of the two values based on the condition. See following example.

Continue reading →

Recently I was working with a project where I was in need to format a number in such a way which can apply leading zero for particular format. So after doing such R and D I have found a great way to apply this leading zero format.

I was having need that I need to pad number in 5 digit format. So following is a table in which format I need my leading zero format.

1-> 00001
20->00020
300->00300
4000->04000
50000->5000

So in the above example you can see that 1 will become 00001 and 20 will become 00200 format so on. So to display an integer value in decimal format I have applied interger.Tostring(String) method where I have passed “Dn” as the value of the format parameter, where n represents the minimum length of the string. So if we pass 5 it will have padding up to 5 digits.

Continue reading →

Microsoft Visual studio 2010 is a Great IDE(Integrated Development Environment) and I am exploring everyday something new in this blog post , I am also going to explore something new with Visual Studio 2010. There are two more new features that can make developers life easier. Let’s explore that in detail.

Variable Reference Code Highlighting

It’s a new feature there in Visual studio 2010. Whenever you put the cursor on the variable it will highlight all the code where that variable used. This is a very nice features as within one shot we can see what is done with that variable in code just like following.

Hiding selected code in Visual Studio 2010

In earlier version of Microsoft Visual Studio We can collapse the method and region. But you can not collapse the particular code block but with Visual Studio 2010 code you can hide the particular selected code via right click outlining –>Hide Selection and you can highlight code lets see first following code.

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

namespace Blogging
{
 public partial class _Default : System.Web.UI.Page
 {
     protected void Page_Load(object sender, EventArgs e)
     {
         if (Page.IsPostBack)
         {
             Response.Write("Page is not postback");
         }

         for (int i = 1; i <= 20; i++)
         {
             Response.Write(i.ToString());
         }
     }
 }
}

Now I want to hide the following Page.IsPostBack part via right click Outlining –> Hide Selection



As you can see in above image there is –(Minus) Icon so you can collapse that code Just like region. Now you want to undo the collapsing then once again you need to select the code in editor and then right click and then select Outlining->Stop Hiding Current and then it will be treated as normal code with out collapsible block Like below.



That’s it hope you liked it.. Stay tuned for more.. Happy programming..

Recently in one the project we require to check whether page is secure or not as we are going to open a new popup window from that page and that why we need to pass https protocol if we have that page secure. I have search lots of things on internet and I have found following ways of finding whether page is secure or not in ASP.NET or JavaScript.

In ASP.NET There are two way of doing it. Either we can use current request to check whether it is secured or not or we can use server variables to check whether it it secure or not just like following.

HttpContext.Current.Request.IsSecureConnection

Here in above code If this returns true then Page is secured otherwise it is not Or you can use following server variable to check the protocol.

Request.ServerVariables["SERVER_PROTOCOL"];

In JavaScript you can document.location.protocol to check whether page is secure or not. Just like following.

document.location.protocol=='https:'

So you can see its very easy to check whether page is secure or not. Hope you liked it… Stay tuned for more..

While developing a windows service using Linq-To-SQL i was in need of something that will intersect the two list and return a list with the result. After searching on net i have found three great use full operators in Linq Union,Except and Intersect. Here are explanation of each operator.

Union Operator: Union operator will combine elements of both entity and return result as third new entities.

Except Operator: Except operator will remove elements of first entities which elements are there in second entities and will return as third new entities.

Intersect Operator: As name suggest it will return common elements of both entities and return result as new entities.

Let’s take a simple console application as a example where i have used two string array and applied the three operator one by one and print the result using Console.Writeline. Here is the code for that.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


namespace ConsoleApplication1
{
 class Program
 {
     static void Main(string[] args)
     {
         string[] a = { "a", "b", "c", "d" };
         string[] b = { "d","e","f","g"};

         var UnResult = a.Union(b);
         Console.WriteLine("Union Result");
         foreach (string s in UnResult)
         {
             Console.WriteLine(s);           
         }

         var ExResult = a.Except(b);
         Console.WriteLine("Except Result");
         foreach (string s in ExResult)
         {
             Console.WriteLine(s);
         }

         var InResult = a.Intersect(b);
         Console.WriteLine("Intersect Result");
         foreach (string s in InResult)
         {
             Console.WriteLine(s);
         }
         Console.ReadLine();
        
     }

 }
}

Here is the output of console application as Expected.

Hope this will help you..

Technorati Tags: Linq,Except,InterSect,Union,C#

In ASP.NET controls used in to the user controls are generate Client Id which unique for the control and If you have so many user controls hierarchy then you will have very long client id like ‘ctl00_CPH_ctl02_BM_userLogin_UserName’.It will increase the Kilo Bytes of html rendered in the browsers. Label control is the control which is used to display text and its render as span tag in the html render by the browser. So in such type of scenario if you have so many label controls then your html is going to increase very much. And overall it will decrease the your application performance.

In asp.net 4.0 we can manage the Client Id via different options i have already posted over here. But for asp.net 3.5 and lower version we have to write our own code for doing that there are two options either we have to create a our own custom control inherited from label which override the ClientID generated by system or we can use the span tag instead of label control because ultimately label control will be rendered as span tag in browser.

We having same scenario in the one of the project we are having so many label controls in one of the form in our page. So it is going to kill our application because rendered HTML will be heavy. So we have decided to use span tag. Now you guys are having questions that how we can manage span text from the server side we have used static string variables for to manage the text of span. Let’s create a simple example to understand how its works.

We have created a static string which will contain the text for the label. We are assigning text in page_load event of page or control then we have used that static string directly in html in between span tag which will have same style sheet as label control. Following is code for that.

protected static string UserName;

protected void Page_Load(object sender, EventArgs e)
{
  if (!Page.IsPostBack)
  {
        //asssign text here for first time
        UserName = "User Name";
  }
}

Now in the html of user control or page you need to write span tax as follows.

<span class="label"><%=UserName%></span>

That’s it will render span tag in your browser with same look as label and there will not be any id generated for this span tag and ultimately your html rendered in browser will have less Kilo Bytes. We able to reduce 10 to 12 KB bytes of our page via this technique. Hope this will help you too..

Technorati Tags: Label,Performance,ASP.NET,C#.NET

Singleton pattern is very popular pattern used by programmer. The idea behind the singleton pattern is to have only one instance of a class at any time. This kind of pattern is very useful for for heavy resources like Linq Data Context etc. It is also useful in multithreaded application where different thread of application try to crate instance of one class but it should be thread safe. It can be also useful for global resources and state objects. In singleton class there are two things required. One static variable which hold the instance of class and other is a static method which will return the instance of singleton class. Here is the example of singleton class

 public class MySingleTon
  {
      private static MySingleTon mySingleTonInstance = new MySingleTon();

      private MySingleTon()
      {
          //private constructor
      }
      public static MySingleTon  GetInstace()
      {
          return mySingleTonInstance;
      }

  }

Now we are done with calling single ton class like following.

 MySingleTon objSingleTon = MySingleTon.GetInstace(); 

The above example is not thread safe so it may be possible that different thread can create different instance of classes. To make above singleton class thread safe we need to change code like following.

   public class MySingleTon
  {
      private static MySingleTon mySingleTonInstance = new MySingleTon();

      private MySingleTon()
      {
          //private constructor
      }
      public static MySingleTon  GetInstace()
      {
          lock (typeof(MySingleTon))
          {
              if (mySingleTonInstance == null)
              {
                  mySingleTonInstance = new MySingleTon();
              }
              return mySingleTonInstance;
          }
       
      }
   }

Hope this will help you…

Technorati Tags: Singleton Pattern,SingleTon Class in C#

While taking interviews for Microsoft.NET i often ask about indexer classes in C#.NET and i found that most of people are unable to give answer that how we can create a indexer class in C#.NET. We know the array in C#.NET and each element in array can be accessed by index same way for indexer class a object was class can be accessed by index. Its very easy to create a indexer class in C#. First lets looks some points related to indexer class in C#.

• Indexer class object can be accessed by index only.
• We can use same mechanism to access object of indexer class as we are doing it for array.
• You can can specify any valid C# type as return type of indexer classes.
• You must have to create a property with parameter using this keyword for indexer class.
• You can also implement multi parameter indexer also.

Let’s create simple indexer class with single parameter and for string type.

 public class MyIndexer
 {
     private string[] MyIndexerData;
     private int SizeOfIndexer;

     //declaring cursor to assing size of indexer
     public MyIndexer(int sizeOfIndex)
     {
         this.SizeOfIndexer = sizeOfIndex;
         MyIndexerData = new string[SizeOfIndexer];
     }

     public string this[int Position]
     {
         get
         {
             return MyIndexerData[Position];
         }
         set
         {
             MyIndexerData[Position] = value;
         }
     }
}

Now we done with indexer class and lets create object of that indexer class and will see output of our console application also. Following is the code for that.

namespace ConsoleApplication1
{
 class Program
 {
     static void Main(string[] args)
     {
         int indexSize=5;
         MyIndexer objMyIndexer = new MyIndexer(indexSize);
         for (int i = 0; i < indexSize; i++)
         {
             objMyIndexer[i] = i.ToString();
             Console.WriteLine("Indexer Object Value-[{0}]: {1}",
         i, objMyIndexer[i]);
         }
         Console.ReadKey();
     }
 }
}

and Here is the output for the indexer class console application.

Technorati Tags: Indexer,C#,Array

In C# we are having automatic properties since C# 3.5 framework but now with Microsoft.NET 4.0 Framework VB.NET 10.0 version we are also having automatic properties for VB.NET Also.

Like in C# we can define automatic like following.

Public string TestProperty
{
get;
set;
}

Same way we can define in automatic Property in VB.NET as follows.

Public Property TestProperty As String 

You can use this properties any where in class same as C# automatic property.

Technorati Tags: VB.NET 10,Automatic Properties.

I am loving more and more visual studio 2010 for some of the cool things. One of the new feature i have found in visual studio 2010 is the selected text. In the earlier version of visual studio 2010 when we select tax then its not maintaining the highlighted code but with visual studio 2010 it is maintain the colored syntax. Isn't that cool?. We can still know that what we are selecting. Like following.

Technorati Tags: Visual Studio 2010,Visual Web Developer 2010,New Features

As we all know we any web page on the internet is state less. We have to write our own mechanism to maintain state between httprequest and httpresponse. Asp.net has great features called viewstate to maintain state during page postback. It will store the element state in hidden variables with _VIEWSTATE. It will look like below.

If you are having large amount of controls then you will have larger viewstate on the page and it will increase your html kb as well as your performance. So to increase the performance of our application we need to store this viewstate in other place. ASP.NET 2.0 has nice new class called SessionPagePersister which will store the viewstate in the session. You just need to override the PageStatePersister property in your page and your viewstate will be on the page.

Here is the code.

Code Snippet

1. protected override PageStatePersister PageStatePersister
2. {
3. get
4. {
5. return new SessionPageStatePersister(this);
6. }
7. \

If you are having so many pages then you have to write that cod manually Instead of doing this you can use inheritance features of C#.NET to write the code in just one way and then inherit your page from that class. Following is the code for that. You can create a class called MyPage that class into all the pages here is the code for class MyPage .

Code Snippet

1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.UI;
6. 
   
7. namespace TestBlogApplication
8. {
9. public class MyPage:System.Web.UI.Page
10. {
11. protected override PageStatePersister PageStatePersister
12. {
13. get
14. {
15. return new SessionPageStatePersister(this);
16. }
17. }
18. 
    
19. }
20. \

and Then inherit the class in your page like following.

Code Snippet

1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.UI;
6. using System.Web.UI.WebControls;
7. 
   
8. namespace TestBlogApplication
9. {
10. public partial class Page1 : MyPage
11. {
12. protected void Page_Load(object sender, EventArgs e)
13. {
14. 
    
15. }
16. }
17. }
18. 
    

So that's it that way you can increase your application performance via maintaining the viewstate in session. Happy Codding..

Technorati Tags: ViewState,Session,ASP.NET2.0,ASP.NET 3.5,ASP.NET4.0

In asp.net 3.5 there is one good features called extension method now you can extend your functionality without modifying existing classes. Extension method allow developers to add own functionality to any existing classes. You don't need to create subclass or don't need to recompile existing classes and still you can extend that class with extension methods. Let's create an example to extend existing string classes to convert a simple string to bold html string.

public static class MyExtensions
{
public static string ConvertToBold(this string mystring)
{
System.Text.StringBuilder myBoldString =new System.Text.StringBuilder(string.Empty);
myBoldString.Append("<strong>");
myBoldString.Append(mystring);
myBoldString.Append("</strong>");
return myBoldString.ToString();  
}
}

So now our extension method is ready. Following the sample code to use this extension method.

protected void Page_Load(object sender, EventArgs e)
{
string helloWorld = "Hello World";
Response.Write(helloWorld.ConvertToBold());
}

While running application you can out like below.

Technorati Tags: Extension,ASP.NET 3.5,C#.NET,String

Microsoft SQL Server are one of the popular RDBMS(Relational Database Management System) all over world. Before some time Microsoft has launched the new version of SQL Server 2008. SQL Server 2008 provides the highest levels of security, reliability, and scalability for your business-critical applications. . Following are the some of new features of SQL Server 2008.

1. Policy based management.
2. Performance Data Collection.
3. Data compression.
4. Resource Generator.
5. Transparent Data Encryption.
6. External Key Management/Extensible Key Management.
7. Data Auditing.
8. Hot-Add CPU and Hot-Add Memory.
9. Streamlined Installation.
10. Server Group Management.
11. Upgrade Advisor.
12. Partition aligned indexed views.
13. Backup Compression.
14. Extended Events.
15. Grouping Set.
16. Merge Operator.
17. Greater Support for LINQ and Entity Framework.
18. Change Data Capture.
19. Table Valued Parameters.
20. Entity data model for entity framework.
21. Synchronization Server with ADO.NET.
22. CLR Improvements.
23. Conflict detection between peer to peer Replication
24. Service Broker Priorities and Diagnostics.
25. Spatial Data with Geography and Geometry data types.
26. Virtual Earth Integration.
27. Sparse Column.
28. Filtered Indexes.
29. Integrated full text search.
30. File stream data.
31. Large user defined types.
32. Large user defined aggregates.
33. Date/Time Data Types.
34. Improved XML Support.
35. ORDPATH.

and many more features are there. It's great rdbms to use in your future projects. Please visit following link to explore above features in great details.

http://www.microsoft.com/sqlserver/2008/en/us/whats-new.aspx

You can download SQL server 2008 Express database for free from following link.

http://www.microsoft.com/express/sql/download/

Technorati Tags: SQL Server,SQL Server 2008,RDBMS,Microsoft

When asp.net page loaded in to browser there are lots of white spaces between tags and in tags that will increase your html kb. For example if your page around 300 kb then it will take 3 second to load on 100 kbps internet connection and in dial up connection it will still take time. So if you want to load your site fast on dial up internet connection then you need to decrease html kb as much you can and removing white spaces from the html will be good idea for that.

Following is the code for the page on which you want to remove white spaces from the html. It will decrease your html kb by 30 percentage.

private static readonly Regex REGEX_FOR_TAGS = new Regex(@">s+<", RegexOptions.Compiled);

private static readonly Regex REGEX_FOR_BREAKS = new Regex(@">[\s]*<",
RegexOptions.Compiled);
protected override void Render(HtmlTextWriter writer)
{
  using (HtmlTextWriter writer = new HtmlTextWriter(new System.IO.StringWriter()))
  {
        base.Render(writer);
        string htmlkb = writer.InnerWriter.ToString();
        htmlkb = REGEX_FOR_TAGS.Replace(htmlkb, "> <");
        htmlkb= REGEX_FOR_BREAKS .Replace(htmlkb, "><");
        writer.Write(html.Trim());
   }
}

Here in the above code there are two regular expression one for white space in tag and another for whitespace between tag and by just overriding the render event of event you can replace the whitespace.

Happy Coding...

Technorati Tags: HTMLKb,ASP.NET,Whitespace,Performance

Client Id is used to store the id of a server control in client side. ASP.NET Engine creates a very long client id to unique identify each element on the same page. If you are having so many inner controls hierarchy then asp.net will generate very long client id like “ctl00_Ctl001_ctl02_BM_Login_btnSave” here i i have used control name like ctrl00,ctr001,bm etc. If you are having long control name then it will more longer then this. This will increase html kilobytes for the pages and if you are having so many server controls in the page then it will take time to load in browser and will decrease performance of application . To overcome this problem we have to override existing asp.net controls like textbox,label etc and then you have override client id from server side with server side id. Now with asp.net 4.0 you can control client id generated by .net framework. In asp.net 4.0 there is one another property called ClientIdMode which will control the behavior of client id generated by .net framework. Like following.

<asp:Button ID="btnSave" runat="server" ClientIDMode="[Mode]" />

There are four types of different mode for ClientIdMode property.

1. Legacy- This is the same as in old version. It will generate client like like “ctl00_Ctl001_ctl02_BM_Login_btnSave” in old fashion.
   


2. Inherit-This is the default mode for every control . It will refer parent control to have its clientidmode. If you want to change it then you have to specify your client id mode for that control.
   


3. Static –This mode will put client id as static if you set server id like “btnSave” then it will generate the same ld like “btnSave”. So if you want to use this mode then you have to make sure that you are having all unique name in one pages. Otherwise it will be a mess for ids.
   


4. Predictable- This mode will used when the framework needs to ensure uniqueness of each control in particular way. The framework traverse from the control to parent controls and put hierarchy of parent control id with control id like ‘”ctrl0_btnsave” and for another btnsave its like “ctrl0_ctrl1_btnsave” etc.
   


Technorati Tags: ASP.NET4.0,ClientId

As an asp.net developer we all must have to use update panel for the ajaxifying our application in today’s ajax world. No one likes postaback now. But when we add the some content with the java script under update panel then some times it’s stop working because of the update panel server side behavior. So what we should do? … Here is the trick. Normally we code java script in the asp.net page like following…

string alertScript = "javascript:alert('Alter From asp.net page')";
ClientScript.RegisterStartupScript(typeof(Page),"alertscript", alertScript);

Instead of this you should use.

string alertScript = "javascript: alert('This is aler from asp.net page')";
ScriptManager.RegisterStartupScript(this, this.GetType(), "alertScript",
                                alertScript,true);

This will work. Happy coding..

Technorati Tags: UpdatePanel,ASP.NET,C#.NET,VB.NET,Microsoft ajax

Microsoft Silvelight 2.0 has been great success for the Microsoft. There lots of rich user friendly animated application is designed with Microsoft Silvelight 2.0. Now with Microsoft has added some new features to Silverlight 3.0. It includes major media enhancement,allowing web applications to view on desktop, Graphic improvement for 3D Support, GPU Acceleration and H-264 Support etc. Following is new feature list for silvelight 3.0

1. Live and on demand true HD Smooth streaming.
2. More format Choice.
3. True HD Playback.
4. Extensible media format support
5. Perceptive 3D Graphics
6. Pixel shader effects.
7. Bitmap Caching.
8. Animation Effect.
9. Enhance control skinning.
10. Improve text rendering and font support.
11. Search Engine Optimization
12. Data Forms and Data Validation.
13. Application library caching
14. Binary Xml.
15. Adobe Photoshop and Illustrator import support
16. Fully compatible with visual studio 2010.

There are many more features. To know more about him please visit following link. http://silverlight.net/getstarted/silverlight3/default.aspx

If you have any question then you can ask here in silverlight community.http://silverlight.net/Community/

You can get started with silvelight 3.0 with following. Its will be great help and tools available on following link. http://silverlight.net/GetStarted/

Technorati Tags: SiverLight,SilverLight3.0,SilverLight 2.0,ASP.NET4.0,WPF and WCF

With C# 2.0 Microsoft has added partial keyword in C#. So what is partial keyword used for. Lets go through the partial keyword in greater detail.

First and foremost use of the partial keyword is the you can declare one class or method with more then one declaration and at the compilation time it will have one complete class.So now you can declare a class more then one file at the compile time it will be treated as one class.

For example this is one class

//first file Patial Class
public class partial PartialClass
{
   public void First()
   {
     //First function
   }
}

 Here is the another class

public class partial PartialClass
{
   public void Second()
   {
      // Logic...
   }
}

Now at the compile time it will be treat as single class like following.

public class PartialClass
{
   public void First()
   {
      // Logic...
   }
   public void Second()
   {
      // Logic...
   }
}

Same way you can use partial method it will treated as one method as compile time. Partial method will only available with C# 3.0. It will not be available to C# 2.0.

Practical Usage Of Partial Class:

There are lots of way where partial class is useful like many developer can work on same class via creating different files. There are lost of code generators available in market so you can extend the class functionality via marking them partial. Partial class can also be used for the manage code in separate files instead of creating large files. With C# 3.5 linq to sql designer uses this concept to split custom behaviors outside mapping class.

Technorati Tags: C# 2.0,C# 3.0,ASP.NET2.0,ASP.NET 3.5,VB.NET,C#.NET,Partial,Partial Class,Partial Method

There lots of ORM(Object Relational Mapper) is available now like entity framework,nhibernate, linq, dlinq but i choose subsonic 3.0 for my next application which will be a question answer site for the following reason

1. Now subsonic 3.0 is with linq support so you can write your lambda expression and linq queries along with the subsonic
2. It comes with simple repository.
3. Built in T4 Templates for 4.0
4. Linq to subsonic.
5. Subsonic 3.0 templates.
6. Can handle thousand of queries at a times.
7. Full support with asp.net 3.5 features.
8. Ease of Use.
9. Great support with asp.net mvc

And another great news is that Rob Conery is hired by the Microsoft and subsonic will official ORM for ASP.net Applications.

You can download subsonic 3.0 from here.

http://www.subsonicproject.com/Download

Technorati Tags: ORM,Object Relation Mapping,Subsonic,Subsonic 3.0,ASP.NET,Linq

Happy Coding..

For every enterprise level application the key to make that application success is the responsiveness of application. ASP.NET also offers great deal of the features for developing web based enterprise application but some times due to avoiding best practice to write application the performance of application performance of application is not so fast as it should be. Here are the some use full suggestion to make your application super fast.

1. Always set debug=”false” in web.config production environment.
2. Always set trace=”false” in web.config production environment
3. If you are using asp.net 2.0 or higher version then always use precompiled version of your code and also prefer web application project over website. If you are using website then always publish it and then upload that precompiled version of your site in production environment.
4. Always compile your project in Release Mode before uploading application to production environment.
5. Decrease your html kb as much as you can for that use tables less html using div’s and if possible then do not give big name to your control it will increase your html kb as asp.net uses client Id to differentiate all the controls. If you are creating custom controls then you can overwrite your clientid and uniqueId.
6. Use cache api as much as possible it will decrease your server roundtrip and boost application performance. ASP.NET 2.0 or higher version provides functionality called sqlcachedependancy for your database caching. It will validate cache with your database operation like insert,update and delete and if not possible with it then use the file base caching.
7. Remove blank spaces from your html it will increase your kb. You can use regular expression to remove white spaces. I will post the code for removing white spaces next posts.
8. For asp.net 2.0 and higher version use master pages. It will increase your performance.
9. Prefer database reader over dataset unless and until you have specific reason to use database.
10. Use ADO.NET asynchronous calls for ado.net methods. asp.net 2.0 or higher version is supporting your performance. If you are using same procedure or command multiple time then use ADO.NET Prepare command it will increase your performance.
11. Do IIS performance tuning as per your requirement.
12. Disable view state for your controls if possible. If you are using asp.net 2.0 or higher version then use asp.net control state instead of view state. Store view state in session or database by overriding the default methods for storing view state.
13. User Server.Transfer instead of response.redirect.
14. Always use inproc session state if possible.
15. Use Ajax for your application wisely. Lots of Ajax calls for a page will also decrease your performance.
16. Measure your application performance with tools like redgate profiler,firebug and whyslovw from yahoo.
17. User System.Text.StringBuilder for string concatenation its 4 times more faster then the normal strings.
18. Right JavaScript in .Js files and place it as bottom of the application.
19. Use Separate CSS files for styling of application.
20. User database paging over normal paging while displaying huge amount of data.
21. Call web service from java script instead of server side. Use asynchronous calls to call a web method from web service.

That’s it!!…..Happy Programming..