private void detach_Saches(Sach entity)
 {
     this.SendPropertyChanging();
     entity.LOAISACH = null;
 }
 private void attach_Saches(Sach entity)
 {
     this.SendPropertyChanging();
     entity.LOAISACH = this;
 }
 partial void UpdateSach(Sach instance);
 partial void DeleteSach(Sach instance);
 partial void InsertSach(Sach instance);