private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("Please Enter Your Credit Card Number", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox1.Focus();
                return;
            }

            else if (textBox1.TextLength < 16)
            {
                MessageBox.Show("Credit card number must contain 16 digits", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox1.Focus();
                return;
            }

            else if (textBox1.TextLength > 16)
            {
                MessageBox.Show("Credit card number must contain 16 digits", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox1.Focus();
                return;
            }

            else if (testForNonNumeric.IsMatch(textBox1.Text))
            {
                MessageBox.Show("Credit card number must contain digits only", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox1.Focus();
                return;
            }



            if (comboBox1.SelectedIndex == -1)    //Nothing selected
            {
                MessageBox.Show("Please enter credit card expiry date", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                comboBox1.Focus();
                return;
            }

            if (comboBox2.SelectedIndex == -1)    //Nothing selected
            {
                MessageBox.Show("Please enter credit card expiry date", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                comboBox2.Focus();
                return;
            }

            if (Convert.ToInt32(comboBox1.SelectedItem) < 10 && Convert.ToInt32(comboBox2.SelectedItem) == 15)
            {
                MessageBox.Show("Credit Card is expired", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                comboBox1.Focus();
                return;
            }


            else if (textBox3.Text == "")
            {
                MessageBox.Show("Please Enter Your CVV Number", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox3.Focus();
                return;
            }

            else if (textBox3.TextLength < 3)
            {
                MessageBox.Show("CVV number must contain 3 digits", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox3.Focus();
                return;
            }

            else if (textBox3.TextLength > 3)
            {
                MessageBox.Show("CVV number must contain 3 digits", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox3.Focus();
                return;
            }

            else if (testForNonNumeric.IsMatch(textBox3.Text))
            {
                MessageBox.Show("CVV number must contain digits only", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                textBox3.Focus();
                return;
            }

            else
            {
                payment = PopulateObject(aBooking);
                aBooking.DepositPaid = "true";
                bookingController.Edit(aBooking);

                paymentController.ADD(payment);
                MessageBox.Show("Your payment has been verified", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);


                ConfirmationForm cf = new ConfirmationForm(aGuest, aBooking);

                cf.StartPosition = FormStartPosition.CenterParent;
                cf.Show();
                this.Hide();
            }
        }