public string CheckTicket(String username, String password, String motorbikePlate) { // Check username + password // If not authenticate, return String.Empty #region Check Authentication if (!UserService.CheckClientAuthentication(username, password)) { return(null); } #endregion Check Authentication // Done check var tmp = TicketBusiness.SelectTypeByPlate(motorbikePlate); var tmp1 = MotorTypeBusiness.SelectMotorTypeByPlate(motorbikePlate); if (tmp == null) { return("Vé ngày"); } else { return(tmp.Description); } }