interface IObservable void AddObserver IObserver void RemoveObserver I

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interface IObservable
{
void AddObserver(IObserver o);
void RemoveObserver(IObserver o);
void NotifyObservers();
}
class ConcreteObservable : IObservable
{
private List<IObserver> observers;
public ConcreteObservable()
{
observers = new List<IObserver>();
}
public void AddObserver(IObserver o)
{
observers.Add(o);
}
public void RemoveObserver(IObserver o)
{
observers.Remove(o);
}
public void NotifyObservers()
{
foreach (IObserver observer in observers)
observer.Update();
}
}
interface IObserver
{
void Update();
}
class ConcreteObserver :IObserver
{
public void Update()
{
}
}