Extension Method

public static {Method Return type} {Method Name}(this {The Class to Extend} {Parameter Name})

public static int IsOdd(this int value)

{

return value%2 != 0

}

Extension method must in static class.

must declared as public and static.

delegate

{Modifier} delegate {Method Return type} {Delegate Name}({Parameter type} {Parameter Name})

public delegate int MyIntDelegate(int number);