private void withdrawButton_Click(object sender, EventArgs e)
{
if (_customer == null)
{
MessageBox.Show("There's no customer or account!");
return;
}
double amount = Convert.ToDouble(amountTextBox.Text);
if (_customer.AccountWithdraw(amount))
{
MessageBox.Show(amount + " Tk. Sueccesfully Deposited!");
}
}
