Just like other languages such as vb, and c/c++, C# can support the optional parameters from 4.0.

here is a code snippet 

   1:  class Program
   2:  {
   3:      static void Main(string[] args)
   4:      {
   5:          MyTest("P1", "P2");
   6:          MyTest("P1");
   7:      }
   8:   
   9:      static void MyTest(string parameter1, string parameter2="Default Value 2")
  10:      {
  11:          Console.WriteLine("Para1={0}, Para2={1}", parameter1, parameter2);
  12:      }
  13:  }

And the returning result will be

Para1=P1, Para2=P2

Para1=P1, Para2=Default Value 2

and the parameter2 will use the default value in the definition if you do not give a value. Quite convenience, isn’t it?