private void detach_Invoice_Products(Invoice_Product entity)
 {
     this.SendPropertyChanging();
     entity.Product = null;
 }
 private void attach_Invoice_Products(Invoice_Product entity)
 {
     this.SendPropertyChanging();
     entity.Product = this;
 }
 partial void UpdateInvoice_Product(Invoice_Product instance);
 partial void DeleteInvoice_Product(Invoice_Product instance);
 partial void InsertInvoice_Product(Invoice_Product instance);