using System;

public class Program

{

    public static void Main()

    {

        EventWorker worker = new EventWorker();

        worker.TestEvent1 += EventHadler;

        worker.EventColler("Hi");

    }

    private static void EventHadler(string message)

    {

        Console.WriteLine("Event value is "  + message);

    }

}

​

public class EventWorker

{

    public delegate void TestDelegate(string message);

    public event TestDelegate TestEvent1;

    public void EventColler(string value)

    {

        if (TestEvent1 != null)

        {

            TestEvent1( value);

        }

    }

}