partial void DeleteHd(Hd instance);
 partial void UpdateHd(Hd instance);
 private void detach_Hds(Hd entity)
 {
     this.SendPropertyChanging();
     entity.Kh = null;
 }
 partial void InsertHd(Hd instance);
 private void attach_Hds(Hd entity)
 {
     this.SendPropertyChanging();
     entity.Kh = this;
 }