private void detach_HOCSINHs(HOCSINH entity)
 {
     this.SendPropertyChanging();
     entity.LOPHOC = null;
 }
 private void attach_HOCSINHs(HOCSINH entity)
 {
     this.SendPropertyChanging();
     entity.LOPHOC = this;
 }
 partial void UpdateHOCSINH(HOCSINH instance);
 partial void DeleteHOCSINH(HOCSINH instance);
 partial void InsertHOCSINH(HOCSINH instance);