Nullable Types in .Net C#

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Since .NET version 2.0, the new feature introduce which is nullable types.  In the basic programming, how do you assign null to the promitive type such as int, long, and bool. Its is impossible.

The following code shows how to define an integer as nullable type and checks if the value of the integer is null or not.

Example 

/// <summary>
/// Nullable types
/// </summary>
public static void TestNullableTypes()
{
   // Syntax to define nullable types
   int? counter;
   counter = 100;

   if (counter != null)
   {

      // Assign null to an integer type
      counter = null;
      Console.WriteLine("Counter assigned null.");
   }
   else
   {

      Console.WriteLine("Counter cannot be assigned null.");
      Console.ReadLine();
   }
}



If you remove the "?" from int? counter, you will see a warning as following:



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