private void LoadStdBill()
        {
            loadBillData = new BillCollection();
            loadBillData.LoadBillWithStdIdFromDb(Int32.Parse(LoginUser.stdLogStudentId));

            foreach (var popBill in loadBillData.pubBillCollect)
            {
                if (DateTime.Parse(popBill.Bill_DueDate) < DateTime.Today)
                {
                    var setOldManage = new BillManager();
                    setOldManage.SetTuitionToOld(popBill.Bill_Id);
                    SetOldPart();
                    stop = true;
                    return;
                }
                lblTotalTuitionContainer.Text     = popBill.Bill_FinalAmount.ToString();
                lblDiscountContainer.Text         = $"{popBill.Bill_Discount.ToString()}%";
                lblTotalBalanceContainer.Text     = popBill.Bill_Balance.ToString();
                lblTotalPaymentMadeContainer.Text = popBill.Bill_PaymentMade.ToString();
                lblFullPaidDateContainer.Text     = popBill.Bill_DatePaid.ToString();
                lblTuitionDueDateContainer.Text   = popBill.Bill_DueDate.ToString();
                billId = popBill.Bill_Id;
            }
        }