static void Main(string[] args)
{
Alarm_Publisher casio = new Alarm_Publisher();
Student_Subscriber don = new Student_Subscriber();
don.Subscribe(casio);
casio.Trigger();
}
public void Subscribe(Alarm_Publisher alarm)
{
TimeToRise del1 = new TimeToRise(WakeUp);
alarm.RingAlarm += del1;
}