public void addDecorator()
{
sandwich.Attach(new ConcreteObserver(sandwich, "observ"));
SandwichMemento mem = sandwich.SaveMemento();
new Corn(sandwich);
}
public override void RestoreMemento(SandwichMemento memento)
{
this.Description = memento.GetDescription();
}
public abstract void RestoreMemento(SandwichMemento memento);
