static void Main(string[] args)
{
ConcreteObserver obs1 = new ConcreteObserver("obs1");
ConcreteObserver obs2 = new ConcreteObserver("obs2");
List <IObserver> observers = new List <IObserver>()
{
obs1, obs2
};
Subject subject = new Subject();
subject.RegisterObserver(obs1);
subject.RegisterObserver(obs2);
subject.State = "state 1";
subject.UnregisterObserver(obs1);
subject.State = "state 2";
}
