public ActionResult BillSchedule(ATMBillSchedule_ViewModel models)
        {
            int sessionUserID = WebSecurity.GetUserId(User.Identity.Name);
            Bank bank = new Bank();

            if (ModelState.IsValid)
            {
                HttpContext.Session["accountNumber"] = null;
                return View(bank.billSchedulePost(sessionUserID, models));
            }
            else
            {
                return BillSchedule();
            }
        }