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What is use of C# "Default" Keyword?

Posted By :Narayanan     Posted Date :December 14, 2011    Points :40   Category :C# 
Initialize default value for its type

You can also find related Interview Question to What is use of C# "Default" Keyword?  below: 

Where to use default keyword?

  
used in the Switch statement or generic code. (More...)

What is Default value of Bool ?

  
0 is the defaault value of boolean in .NET (More...)

Yield keyword in C Sharp

  
C Sharp and yield keyword

Hi,



One of the cool and yet most unknown feature of the C# is the yield keyword. The yield keyword is used in an iterator block to provide a value to the enumerator object or to signal the end of the iteration. When used the expression is evaluated and returned as a value to the enumerator object. Note the expression has to be implicitebly convertible to yield type of the iterator. Here is an example



public static IEnumerable GetIntCollectionFromString(string SomeString){ string[] val = SomeString.Split(' '); int intToAdd; foreach (string token in val) { if (int.TryParse(token, out intVal)) { yield return intVal; } else { yield break; } }}

Here since we are using the yield keyword the function will return the collection of intVal instead of the value of intVal. The statement will only return when the iteration of the loop is complete.



There are some limitation with the yield keywords.

Unsafe blocks are not allowed
Parameters to the method, operator, or accessor cannot be ref or out. (More...)

By Default, ASP.NET does not allow HTML tags to be sent to server via client side due to security reason. Which property needs to be set that allows HTML tags to be processed by server?

  
ValidateRequest Property needs to be set to false. By default it's true so it does not allow unencoded HTML tags to be processed at server. It can be set at page level or at application level via web.config. (More...)

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