private void detach_Product_Images(Product_Image entity)
 {
     this.SendPropertyChanging();
     entity.Product = null;
 }
 private void attach_Product_Images(Product_Image entity)
 {
     this.SendPropertyChanging();
     entity.Product = this;
 }
 partial void UpdateProduct_Image(Product_Image instance);
 partial void DeleteProduct_Image(Product_Image instance);
 partial void InsertProduct_Image(Product_Image instance);