private void detach_Photo(Photo entity)
		{
			this.SendPropertyChanging();
			entity.Photo_Category = null;
		}
		private void attach_Photo(Photo entity)
		{
			this.SendPropertyChanging();
			entity.Photo_Category = this;
		}
 partial void UpdatePhoto(Photo instance);
 partial void DeletePhoto(Photo instance);
 partial void InsertPhoto(Photo instance);