private void backBtn_Click(object sender, EventArgs e)
        {
            this.Hide();
            BankManjah add = new BankManjah("");

            add.Show();
        }
        private void withdrawUSDBtn_Click(object sender, EventArgs e)
        {
            try
            {
                int amount = Convert.ToInt32(tfAmount.Text);

                bool status = user.getCashWithdrawalIDR(amount);
                if (status)
                {
                    DateTime time    = DateTime.Today;
                    string   success = "Successfully withdrawal IDR " + amount + "!";
                    history.addHistory(time.ToString(), success);
                    this.Hide();
                    BankManjah add = new BankManjah(success);
                    add.Show();
                }
                else
                {
                    labelMessage.Text = "Your balance is not enough!";
                }
            }
            catch
            {
                if (tfAmount.Text == "")
                {
                    labelMessage.Text = "Fill the blank!";
                }
                labelMessage.Text = "Make sure you fill with numbers!";
            }
        }