using System;
using System.Collections.Generic;
using System.Text;

namespace DelegateSimple
{
class Program
{
public delegate void MessagePrintDelegate(string msg);
private delegate int GetCountDelegate(Person obj1, Person obj2);
protected delegate void LongRunningDelegate(MessagePrintDelegate mpCallBack);

static void Main(string[] args)
{
    MessagePrintDelegate mpDel = new MessagePrintDelegate(PrintMessage);
    GetCountDelegate gcd = new GetCountDelegate(GetCount);
    int count = gcd( new Person(), new Person());
    Console.WriteLine("Count received {0}", count);
    LongRunningDelegate lrd = new LongRunningDelegate(LongRunningMethod);
    lrd(mpDel);
    Console.ReadLine();
}

static void LongRunningMethod(MessagePrintDelegate mpd)
{
    for (int i = 0; i < 99; i++)
    {
        if (i % 10 == 0)
        {
            mpd(string.Format(
                "Making progress. {0}% Complete.", i));
        }
    }
}

static int GetCount(object obj1, object obj2)
{
    // perform some processing
    Random rnd = new Random();
    return rnd.Next();
}

static void PrintMessage(string msg)
{
    Console.WriteLine("[{0}] {1}", DateTime.Now.ToShortTimeString(), msg);
}
}

class Person
{
}

class Contact : Person
{
}
}