example of event nulling behavior

Program.cs

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

//Expected Output:
// 
//Execute: (Status: null)
//=======
//Execute: (Status: not null)
//Callback
//=======
//Execute: (Status: null)
//=======
//Execute: (Status: null)
//=======
//Execute: (Status: not null)
//Callback
//=======
//Execute: (Status: null)
//=======

namespace TestEventNulling
{
    class EventHolder
    {
        public void Execute()
        {
            if (MyEvent != null)
            {
                MyEvent();
            }
        }

        public void NullOut()
        {
            MyEvent = null;
        }

        public bool EventStatus()
        {
            return MyEvent == null;
        }

        public event Action MyEvent;
    }
    class Program
    {
        private static EventHolder m_eh;

        static void Main(string[] args)
        {
            m_eh = new EventHolder();

            Test();

            m_eh.MyEvent += Callback;
            Test();

            m_eh.NullOut();
            Test();

            m_eh.MyEvent -= Callback;
            Test();

            m_eh.MyEvent += Callback;
            Test();

            m_eh.MyEvent -= Callback;
            Test();

        }

        static void Callback()
        {
            Console.WriteLine("Callback");
        }

        static void Test()
        {
            Console.WriteLine("Execute: (Status: {0}null)", m_eh.EventStatus() ? "" : "not ");
            m_eh.Execute();
            Console.WriteLine("=======");
        }
    }
}