partial void DeleteOrderTB(OrderTB instance);
 partial void UpdateOrderTB(OrderTB instance);
 private void detach_OrderTBs(OrderTB entity)
 {
     this.SendPropertyChanging();
     entity.UserTB = null;
 }
 partial void InsertOrderTB(OrderTB instance);
 private void attach_OrderTBs(OrderTB entity)
 {
     this.SendPropertyChanging();
     entity.UserTB = this;
 }