private void detach_chiTiet_HDBans(chiTiet_HDBan entity)
 {
     this.SendPropertyChanging();
     entity.SanPham = null;
 }
 partial void UpdatechiTiet_HDBan(chiTiet_HDBan instance);
 partial void DeletechiTiet_HDBan(chiTiet_HDBan instance);
 partial void InsertchiTiet_HDBan(chiTiet_HDBan instance);