using System;

public class Program

{

    public delegate void SampleDelegate();

    public interface ISampleEvents

    {

        event SampleDelegate SampleEvent;

        void Invoke();

    }

    public class SampleClass : ISampleEvents

    {

        public event SampleDelegate SampleEvent;

        public void Invoke()

        {

            if (SampleEvent != null)

            {

                SampleEvent();

            }

        }

    }

    public static void Main()

    {

        ISampleEvents ISE = new SampleClass();

        ISE.SampleEvent += new SampleDelegate(Event);

        ISE.Invoke();

    }   

    static void Event()

    {

        Console.WriteLine("Event");

    }

}