using System;

public delegate void Del(string message);

​

public class Program

{

// Create a method for a delegate.

public static void DelegateMethod(string message)

{

    Console.WriteLine(message);

}

    public static void MethodWithCallback(int param1, int param2, Del callback)

{

    callback("The number is: " + (param1 + param2).ToString());

}

    public static void Main()

    {

// Instantiate the delegate.

Del handler = DelegateMethod;

​

// Call the delegate.

handler("Hello World");

    MethodWithCallback(1, 2, handler);

Console.WriteLine("Hello Wld");

    }

}