private void btnConfirmPayment_Click(object sender, EventArgs e)
        {
            try
            {
                string errMsg = ValidateForm();
                if (errMsg != string.Empty)
                {
                    MessageBox.Show(errMsg, "Invalid Information", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
                else
                {
                    PaymentBL paymentBL = new PaymentBL();

                    Payment_Entity p = new Payment_Entity()
                    {
                        StudentId       = s.StudentId,
                        AmountOfPayment = Convert.ToDecimal(txtAmountOfPayment.Text),
                        Date            = DateTime.Now
                    };
                    if (paymentBL.MakePayment(p))
                    {
                        PopulateStudent(s.StudentId);
                        MessageBox.Show("Payment made!");
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }