상속: INotifyPropertyChanging, INotifyPropertyChanged
 partial void DeleteQuestionChoice(QuestionChoice instance);
 partial void UpdateQuestionChoice(QuestionChoice instance);
		private void detach_QuestionChoices(QuestionChoice entity)
		{
			this.SendPropertyChanging();
			entity.Choice = null;
		}
 partial void InsertQuestionChoice(QuestionChoice instance);
		private void attach_QuestionChoices(QuestionChoice entity)
		{
			this.SendPropertyChanging();
			entity.Question = this;
		}