//Caretaker
static void Main(string[] args)
{
List <Memento> savedStates = new List <Memento>();
Originator originator = new Originator();
originator.SetState("State1");
savedStates.Add(originator.Create());
originator.SetState("State2");
originator.SetState("State3");
savedStates.Add(originator.Create());
originator.SetState("State4");
foreach (var state in savedStates)
{
originator.Restore(state);
}
}