another_can_you_guess_output.cs

class Program
{
    static void Main(string[] args)
    {
        TestEvents test = new TestEvents();        

        test.SomethingOccured += (s, e) => Console.WriteLine("Test1");
        test.SomethingOccured += (s, e) => Console.WriteLine("Test2");

        test.SomethingOccured -= (s, e) => Console.WriteLine("Test1");
        test.SomethingOccured -= (s, e) => Console.WriteLine("Test2");
        
        test.FireSomethingOccured();                  
    }

    public class TestEvents
    {
        private readonly EventHandlerList _events = new EventHandlerList();
        private readonly static object SomethingOccuredEvent = new object();

        public event EventHandler<EventArgs> SomethingOccured
        {
            add
            {
                _events.AddHandler(SomethingOccuredEvent, value);
            }
            remove
            {
                _events.RemoveHandler(SomethingOccuredEvent, value);
            }
        }

        public void FireSomethingOccured()
        {
            var somethingOccured = _events[SomethingOccuredEvent] as EventHandler<EventArgs>;
            if (somethingOccured != null)
            {
                somethingOccured(this, EventArgs.Empty);
            }
        }
    }
}