BankSystem.Account.WithdrawMoney C# (CSharp) Method

        public virtual void WithdrawMoney(decimal money)
        {
            balance -= money;
        }

        public void Transaction()
        {
            Show("Please insert your card");
            string id = GetInput();

            Show("Please enter your password");
            string pwd = GetInput();

            Account account = bank.FindAccount(id, pwd);

            if (account == null)
            {
                Show("Card invalid or password not corrent");
                return;
            }

            Show("1: display; 2: save; 3: withdraw");
            string op = GetInput();

            if (op == "1")
            {
                Show("Balance: " + account.getMoney());
            }
            else if (op == "2")
            {
                Show("Save money");
                string smoney = GetInput();
                double money  = double.Parse(smoney);

                bool ok = account.SaveMoney(money);
                if (ok)
                {
                    Show("OK");
                }
                else
                {
                    Show("error");
                }

                Show("Balance: " + account.getMoney());
            }
            else if (op == "3")
            {
                Show("Withdraw money");
                string smoney = GetInput();
                double money  = double.Parse(smoney);

                bool ok = account.WithdrawMoney(money);
                if (ok)
                {
                    Show("OK");
                }
                else
                {
                    Show("error");
                }

                Show("Balance: " + account.getMoney());
            }
        }