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. }
16. 
    

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

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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

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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. }
8. 
   

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. }
5. 
   

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

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