Extending using Extension methods

static class MyExtensionMethods
{
     public static int Negate(this int value)
     {
        return -value;
     }

     public static int Multiply(this int value, int multiplier)
     {
        return value * multiplier;
     }
}

static void Main(string[] args)
{
      // Passing arguments in extension methods
      int i3 = 10;
      Console.WriteLine(i3.Multiply(2));
}