private void StoreData()
        {
            var cashier = AccountInformation.GetInstance().CurrentAccount.Employee;
            var bill    = new MaintenanceBill()
            {
                BikeID          = bike.ID,
                Date            = DateTime.Now,
                CashierID       = cashier.ID,
                StoreID         = cashier.StoreID,
                CustomerPayment = customer
            };

            bill.ID = MaintenanceBillDAL.GetInstance().Insert(bill);
            foreach (var item in currentList)
            {
                item.BillID = bill.ID;
                var billDetailID = BillDetailDAL.GetInstance().Insert(item);
                //foreach (var billEmp in item.BillEmployees)
                //{
                //    billEmp.BillDetailID = billDetailID;
                //    BillEmployeesDAL.GetInstance().Insert(billEmp);
                //}
            }
            MessageBox.Show("Create Bill Success");
            this.Close();
        }
        public long Insert(MaintenanceBill bill)
        {
            long id = 1;

            using (var db = new MotorcycleShopsEntities())
            {
                db.MaintenanceBills.Add(bill);
                db.SaveChanges();
                id = bill.ID;
            }
            return(id);
        }