public void withdraw(long accountId, int amountToWithdraw)
        {
            var users   = SystemDB.users;
            var _user   = users.Where(x => x.ID == accountId).FirstOrDefault();
            int balance = _user.Balance;
            // int newBalance = balance + Convert.ToInt32(deposit);
            long id = _user.ID;

            if (balance - amountToWithdraw > 999)
            {
                _user.Balance = _user.Balance - amountToWithdraw;
                frmSavingsAccount formSavings = new frmSavingsAccount();
                formSavings.Balance = _user.Balance;
                formSavings.ID      = _user.ID;
                formSavings.Show();
            }
            else
            {
                MessageBox.Show("You cannot have less than R1000 in your savings account");
                frmSavingsAccount formSavings = new frmSavingsAccount();
                formSavings.Balance = _user.Balance;
                formSavings.ID      = _user.ID;
                formSavings.Show();
            }
        }
        public void deposit(long accountId, int amountToDeposit)
        {
            var users   = SystemDB.users;
            var _user   = users.Where(x => x.ID == accountId).FirstOrDefault();
            int balance = _user.Balance;
            // int newBalance = balance + Convert.ToInt32(deposit);
            long id = _user.ID;

            _user.Balance = _user.Balance + amountToDeposit;
            frmSavingsAccount formSavings = new frmSavingsAccount();

            formSavings.Balance = _user.Balance;
            formSavings.ID      = _user.ID;
            formSavings.Show();
        }
        public void openSavingsAccount(long accountId, long amountToDeposit)
        {
            var users      = SystemDB.users;
            int usersCount = users.Count;

            if (accountId - 1 < usersCount)
            {
                var _user = users.Where(x => x.ID == accountId).FirstOrDefault();
                if (_user.Account == "Savings")
                {
                    int    balance = _user.Balance + Convert.ToInt32(amountToDeposit);
                    long   id      = _user.ID;
                    string account = _user.Account;
                    long   deposit = amountToDeposit;
                    if (deposit > 999)
                    {
                        frmSavingsAccount formSavings = new frmSavingsAccount();
                        formSavings.ID      = id;
                        formSavings.Deposit = deposit;
                        _user.Balance       = balance;
                        formSavings.Balance = _user.Balance;
                        formSavings.Show();
                    }
                    else
                    {
                        MessageBox.Show("Please deposit atleast R1000 before you can open your account.");
                        frmSavingsAccount formSavings = new frmSavingsAccount();
                        formSavings.ID      = id;
                        formSavings.Balance = _user.Balance;
                        formSavings.Show();
                    }
                }
                else
                {
                    MessageBox.Show("You do not have a savings account");
                }
            }
            else
            {
                MessageBox.Show("No such account exists");
            }
        }