private void detach_CartTBs(CartTB entity)
 {
     this.SendPropertyChanging();
     entity.ProductTB = null;
 }
 private void attach_CartTBs(CartTB entity)
 {
     this.SendPropertyChanging();
     entity.ProductTB = this;
 }
 partial void UpdateCartTB(CartTB instance);
 partial void DeleteCartTB(CartTB instance);
 partial void InsertCartTB(CartTB instance);