using System;

using System.Reflection;

​

public class Program

{

    public static void Main(string[] commandString)

    {

        var subscriber = new EventSubscriber();

        subscriber.OnCertainEvent(Console.WriteLine);

        subscriber.EmulateEventBeingRaised();

        subscriber.OnCertainEvent(str => Console.WriteLine(str + "Me too"));

        subscriber.OnCertainEvent(str => Console.WriteLine(str + "Me three"));

        subscriber.EmulateEventBeingRaised();

        subscriber.OnCertainEvent(str => Console.WriteLine(str + "I want in on this too!"));

        subscriber.EmulateEventBeingRaised();

        subscriber.EmulateEventBeingRaised();

        subscriber.EmulateEventBeingRaised();

        Console.WriteLine();

        Console.ReadLine();

    }

    public class EventSubscriber

    {

        event Action<string> CertainEvent;

        int counter;

        public void EmulateEventBeingRaised() 

        {

            counter++;

            if (CertainEvent != null)

            {

                CertainEvent("Hey, we did it, " + counter + " times...");

            }

        }

        public void OnCertainEvent(Action<string> handler)

        {

            CertainEvent += handler;

        }

    }

}