partial void Deletequestion(question instance);
 partial void Updatequestion(question instance);
		private void detach_questions(question entity)
		{
			this.SendPropertyChanging();
			entity.category = null;
		}
 partial void Insertquestion(question instance);
		private void attach_questions(question entity)
		{
			this.SendPropertyChanging();
			entity.category = this;
		}