What's new in C# 3.0 ? Part 2

Consider the following , iam working in a project and i made a class and i made a simple method inside this class after small period i wanted to modify or add something in this method all what i have to do just back to the code of this function and modify its code , this is good

but what if this Method was in dll or was in a sealed class or i wanted to add method in a class of the primitive data types ? what can i do ?? the Extension Method was the Solution.

eg.. i want to add a small Method to the string type which return the second word in a given string
it will be like this

static class beta
{
  public  static string GetSecondWord(this string input)
  {
      string  y="";
      int count = 0;
      bool flag = false ;
      foreach  (char c in input)
      {
          if (c == ' ')
          {
              flag =      true;
              count++;
          }
          if (flag == true && count == 1)
          {
                    if(    c != ' ')
              y += c;

          }
      }
      return  y;
  }
}

Notes : 

1. Make sure that the class is static
2. Add this keyword before the type of the argument you want to extend.

so now you can write this code,

string x = "some string value";
string y = x.GetSecondWord();

That’s it.
See you in the Next Part isA