public void Run()
{
var subject = new ConcreteSubject();
subject.Attach(new ConcreteObserver("Observer 1", subject));
subject.Attach(new ConcreteObserver("Observer 2", subject));
subject.Attach(new ConcreteObserver("Observer 3", subject));
subject.State = "Hello World";
subject.State = "abc";
}
public ConcreteObserver(string name, ConcreteSubject subject)
{
Name = name;
_subject = subject;
}