Events are assignable, like delegates

alarmevent.cs

namespace AlarmNamespace
{
    public class AlarmEventArgs : EventArgs
    {
        private DateTime alarmTime;
        private bool snoozeOn = true;

        public AlarmEventArgs (DateTime time)
        {
            this.alarmTime = time;
        }

        public DateTime Time
        {
            get { return this.alarmTime; }
        }

        public bool Snooze
        {
            get { return this.snoozeOn; }
            set { this.snoozeOn = value; }
        }
    }

    public class Alarm
    {
        private DateTime alarmTime;
        private int interval = 10;

        public delegate void AlarmEventHandler (object sender, AlarmEventArgs e);

        public event AlarmEventHandler AlarmEvent;

        public Alarm (DateTime time)
            : this (time, 10)
        {
        }

        public Alarm (DateTime time, int interval)
        {
            this.alarmTime = time;
            this.interval = interval;
        }

        public void Set ()
        {
            while (true)
            {
                System.Threading.Thread.Sleep (100);
                DateTime currentTime = DateTime.Now;
                // Test whether it is time for the alarm to go off. 
                if (currentTime.Hour == alarmTime.Hour &&
                    currentTime.Minute == alarmTime.Minute)
                {
                    AlarmEventArgs args = new AlarmEventArgs (currentTime);
                    OnAlarmEvent (args);
                    if (!args.Snooze)
                        return;
                    else
                        this.alarmTime = this.alarmTime.AddMinutes (this.interval);
                }
            }
        }

        protected void OnAlarmEvent (AlarmEventArgs e)
        {
            AlarmEvent (this, e);
        }

        static void Main ()
        {
            Alarm a = new Alarm (DateTime.Now.AddSeconds(1));
            a.AlarmEvent += (o, e) => Console.WriteLine (1);
            a.AlarmEvent += (o, e) => Console.WriteLine (2);
            a.AlarmEvent = (o, e) => Console.WriteLine (3);

            a.Set ();
            Console.Read ();
        }
    }
}

@mpipalia !
So true, So great.
thanks for the help