public void Main()
        {
            ISubject boss     = new Boss();
            Observer observer = new Observer1("sss", boss);

            boss.Attach(observer);
            boss.Notify();
        }
 public void Main()
 {
     ISubject boss=new Boss();
     Observer observer=new Observer1("sss",boss);
     boss.Attach(observer);
     boss.Notify();
 }