ASP.NET 4.0 New Feature- RepeatLayout property for CheckBoxList and RadioButtonList Controls.

ASP.NET 4.0 having many many new features. One of them is the RepeatLayout property for the CheckBoxList and RadioButtonList controls. The property is useful when we need decide how this controls will be render as html when its load in browser .

Code Snippet

1. <div>
2. <asp:CheckBoxList ID="checkboxList" runat="server" RepeatLayout=UnorderedList>
3. <asp:ListItem Text="Checkbox1" Value="1"></asp:ListItem>
4. <asp:ListItem Text="Checkbox2" Value="2"></asp:ListItem>
5. </asp:CheckBoxList>
6. </div>
7. 
   

There are four options available there.

1. Flow
2. OrderedList
3. Table
4. UnorderedList

Flow: This option will render control with span tag. This option will be better when you need tables less html for your site.

OrderedList:This option will load contriol as orderedlist. It will load html with <ol> and <li> Tags.

Table:If you love table structure then this is the option for you it will load html with <table><tr> and <td> tags.

UnorderedList: This option will load control as UnorderedList. It will load with <ul> and <li> tags.

So this property will useful when you want to have more control over html rendering in your browser as per your requirement.

Happy Programming...

Technorati Tags: ASP.NET 4.0,C#.NET4.0,RadioButtonList,CheckBoxList

C# 4.0 New feature - Named Parameter

C# 4.0 has one new cool features which is the named parameter. Suppose you have so many parameter in function and when you call them its hard to remember the sequence of the code now with the named parameter you can have name of the parameter with value like Parameter:value and one another cool feature of the name parameter is the you don't need to pass the parameter in exact sequence. Let see the following example

Code Snippet

1. protected void Page_Load(object sender, EventArgs e)
2.         {
3.             foreach (int i in Square( max:10,min:1))
4.             {
5.                 Response.Write(i.ToString() + " ");
6.             }
7.         }
8.         
9.         public static IEnumerable<int> Square(int min, int max)
10.         {
11.             for (int i = min; i < max; i++)
12.             {
13.                 yield return i*i;
14.             }
15.         }

In above example I am having a function called square with two parameter min and max  and having a function which will return the square of the given range between min and max. See the for each loop carefully. I have named parameters and another thing you will notice that i have changed the sequence of parameter but still its working fine. So this is a very cool new feature from the C# 4.0.

Happy Programming...

Technorati Tags: C#4.0,ASP.NET 4.0

Visual Studio 2010- New Features Selected Text.

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

Yield statement in C#

Yield statement is one of most interesting statement in the C# 2.0. I have heard about lot of yield statement but today i have learned about yield statement. Yield statement can be used to return multiple object from a method while retaining its state. You can get item in sequence with help of yield.Let take a simple example to see the power or yield statement.

Let's create one example which will help you the understand how its works Let create a function will return the square each time this function is called.

Code Snippet

1. public static IEnumerable<int> Square(int min, int max)
2.         {
3.             for (int i = min; i < max; i++)
4.             {
5.                 yield return i*i;
6.             }
7.         }

Now each time this method is called it will return the square of current value within a given range and its also maintains the state between calls. Let create for each loop to call the the square function above.

Code Snippet

1. foreach (int i in Square(1, 10))
2.             {
3.                 Response.Write(i.ToString() + " ");
4.             }

And here will be the output in the browser.

So it will create IEnumerable without implementing any interface and lesser code.

Happy Programming..

Technorati Tags: C# 3.0,C# 4.0,Yield

C# 4.0 - Optional Parameters

With .net framework 4.0 and C# 4.0 also introduces a new feature called optional parameters it was there in VB since visual basic 6.0. But it is now available in the C# with 4.0 version. Optional parameter will be become very handy when you don't want to pass some parameter and just you need the default value. For that Till C# 3.0 we need to create overloaded functions where we creating function with different argument with same function name. Let's see how its works

Let's go through a simple scenario we will create function with simple response.write which will print a string which will be optional argument.

Code Snippet

1. protected void Page_Load(object sender, EventArgs e)
2.         {
3.             PrintMessage();
4.             PrintMessage("This is message to print passed as argument");
5.         }
6.         private void PrintMessage(string MessageToPrint="This is default message to print")
7.         {
8.             Response.Write(MessageToPrint);  
9.         }

See the above example in that we have created one created once function PrintMessage which will print message on web page thorough Response.Write. And in the Page_Load event we called two times first one is which without argument which will print default message and another one which will have message an message argument which will print message which we have passed. Lets run that application and following out put will produced.

So that's it it will work like this if you passed argument the it will use argument or otherwise its will use the default argument. This will become handy and you don't need to write overloaded function with default value.

Happy Programming ...

Technorati Tags: C#4.0,ASP.NET 4.0,New Features