using System;

using del;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        //del.DelegateVoid del = speak;

    MyClass myclass = new MyClass();

    }

}

​

namespace del{

public delegate string DelegateVoid();

    public class MyClass {

      public string speak(){

          string h= "Hello";

          return h;

      }

        public MyClass() {

DelegateVoid callback = speak;

            callback();

            usedel("John", callback);

        }

        void usedel(string name, DelegateVoid delegateFunc){

           Console.WriteLine(name + ", " + delegateFunc());

        }

    }

}