partial void DeleteSANPHAM(SANPHAM instance);
 partial void UpdateSANPHAM(SANPHAM instance);
 private void detach_SANPHAMs(SANPHAM entity)
 {
     this.SendPropertyChanging();
     entity.LOAISP = null;
 }
 partial void InsertSANPHAM(SANPHAM instance);
 private void attach_SANPHAMs(SANPHAM entity)
 {
     this.SendPropertyChanging();
     entity.LOAISP = this;
 }