public void TestCase6()
{
Receiver receiver = new Receiver();
Command cmd = new ConcreteCommand(receiver, "Hello World");
Invoker invoker = new Invoker();
invoker.StoreCommand(cmd);
invoker.Invoke();
invoker.UndoInvoke();
}
public ConcreteCommand(Receiver receiver, string state)
{
_receiver = receiver;
_state = state;
}