protected virtual void OnRaiseCustomEvent(MeetingEvent e)
        {
            EventHandler <MeetingEvent> handler = RaiseEvent;

            if (handler != null)
            {
                handler(this, e);
            }
        }
 void HandleCustomEvent(object sender, MeetingEvent e)
 {
     Console.WriteLine(userid + " received message: " + e.Message);
 }