Command.Invoker.SetCommand C# (CSharp) Method

        public void SetCommand(Command command)
        {
            this._command = command;
        }

        static void Main(string[] args)
        {
            var invoker = new Invoker();

            invoker.SetCommand("1", new CreateCommand());
            invoker.SetCommand("2", new ComplexCommand(new ImportantBusinessClass()));
            invoker.SetCommand("3", new ChangeItemCommand(new Item()
            {
                Name = "ChangedItem", State = false
            }));
            string inputToQuit;

            do
            {
                Console.WriteLine("Choose command to execute");
                invoker.PrintAllCommands();
                var input = Console.ReadLine();
                if (!invoker.TryActivateCommand(input))
                {
                    Console.WriteLine("Unknown command");
                }

                Console.WriteLine("If you want to undo last command enter undo");
                var undo = Console.ReadLine();
                if (undo == "undo")
                {
                    invoker.UndoLastCommand();
                }

                Console.WriteLine("Do you wanna quit? y/n");
                inputToQuit = Console.ReadLine();
            } while (inputToQuit == "n");
            Console.WriteLine("GoodBye");
        }