public static void UpdateSoLuongCTHD(int mahd, int mamon, int soluong, int mode)
 {
     ChiTietHoaDon_DAO dao = new ChiTietHoaDon_DAO();
     dao.UpdateSoLuongCTHD(mahd, mamon, soluong, mode);
 }
 public static DataTable SelectTableCTHD(int mahd)
 {
     ChiTietHoaDon_DAO dao = new ChiTietHoaDon_DAO();
     return dao.SelectTableCTHD(mahd);
 }
 public static List<ChiTietHoaDon_DTO> SelectCTHDtheoMaHD(int mahd, int mode)
 {
     ChiTietHoaDon_DAO dao = new ChiTietHoaDon_DAO();
     return dao.SelectCTHDtheoMaHD(mahd, mode);
 }
 public static void insertCTHD(int mahd, int mamon, int soluong, int mode)
 {
     ChiTietHoaDon_DAO dao = new ChiTietHoaDon_DAO();
     dao.insertCTHD(mahd, mamon, soluong, mode);
 }
 public static void DeleteCTHDtheoMaHD(int mahd)
 {
     ChiTietHoaDon_DAO dao = new ChiTietHoaDon_DAO();
     dao.DeleteCTHDtheoMaHD(mahd);
 }
 public static void DeleteCTHD(int mahd, int mamon)
 {
     ChiTietHoaDon_DAO dao = new ChiTietHoaDon_DAO();
     dao.DeleteCTHD(mahd, mamon);
 }