Inheritance: INotifyPropertyChanging, INotifyPropertyChanged
 partial void DeleteProduct(Product instance);
 partial void UpdateProduct(Product instance);
		private void detach_Products(Product entity)
		{
			this.SendPropertyChanging();
			entity.Category = null;
		}
 partial void InsertProduct(Product instance);
		private void attach_Products(Product entity)
		{
			this.SendPropertyChanging();
			entity.Category = this;
		}