public MainObserverProgram()
{
//Scenario creation
this.ConcreteSubject1 = new Subject(0, "Concrete Subject 1");
this.ConcreteSubject2 = new Subject(1, "Concrete Subject 2");
this.ObserverA = new ConcreteObserverA();
this.ObserverB = new ConcreteObserverB();
ConcreteSubject1.AttachObserver(ObserverA);
ConcreteSubject1.AttachObserver(ObserverB);
ConcreteSubject2.AttachObserver(ObserverA);
}