//Author: Linhting
 public int Insert(BookingHalls bookingHalls)
 {
     try
     {
         BookingHsBO aBookingHsBO = new BookingHsBO();
         aDatabaseDA.BookingHalls.Add(bookingHalls);
         aBookingHsBO.AutoChangeStatusBookingH(bookingHalls.IDBookingH);
         return aDatabaseDA.SaveChanges();
     }
     catch (Exception ex)
     {
         throw new Exception("BookingHallsBO.Insert:" + ex.ToString());
     }
 }