partial void DeleteProductReview(ProductReview instance);
 partial void UpdateProductReview(ProductReview instance);
 private void detach_ProductReview(ProductReview entity)
 {
     this.SendPropertyChanging();
     entity.Product = null;
 }
 partial void InsertProductReview(ProductReview instance);
 private void attach_ProductReview(ProductReview entity)
 {
     this.SendPropertyChanging();
     entity.Product = this;
 }