static void Main()
{
// Configure Observer pattern
ConcreteSubject s = new ConcreteSubject();
Observer obs_a = new ConcreteObserver(s,"X");
Observer obs_b = new ConcreteObserver(s,"Y");
Observer obs_c = new ConcreteObserver(s,"Z");
s.Attach(obs_a);
s.Attach(obs_b);
s.Attach(obs_c);
// Change subject and notify observers
s.SubjectState = "ABC";
s.Notify();
s.SubjectState = "DEF";
s.Notify();
s.Detach(obs_a);
s.SubjectState = "GHI";
s.Notify();
// Wait for user
Console.Read();
}
