private static void Main()
{
//Here's a new supplier for our restaurant.
FoodSupplier supplier = new FoodSupplier("Harold Karstark", "(482) 555-1172", "S Main St. Nowhere, KS");
// Let's store that entry in our database.
SupplierMemory memory = new SupplierMemory(supplier);
memory.Backup();
supplier.Name = "A";
memory.Backup();
supplier.Name = "B";
memory.Backup();
supplier.Name = "C";
Console.WriteLine();
memory.ShowHistory();
Console.WriteLine("\nClient: Now, let's rollback!\n");
memory.Undo();
Console.WriteLine("\n\nClient: Once more!\n");
memory.Undo();
Console.WriteLine("\n\nClient: Once more!\n");
memory.Undo();
}
