public string RemoveAnswerFromQuestion(DTO.QuestionAnswers QuestionAnswer)
        {
            DAO.QuestionAnswers _QuestionAnswer = m_QuestionManagement.GetAnswer(QuestionAnswer.QuestionId, QuestionAnswer.AnswerId);

            m_QuestionManagement.RemoveAnswer(_QuestionAnswer);
            return(string.Empty);
        }
        public string AddAnswerToQuestion(DTO.QuestionAnswers QuestionAnswer)
        {
            DAO.Question _Question = m_QuestionManagement.GetQuestion(QuestionAnswer.QuestionId);
            DAO.Answer   _Answer   = m_AnswerManagement.GetAnswer(QuestionAnswer.AnswerId);

            m_QuestionManagement.AddAnswer(_Question, _Answer);
            return(string.Empty);
        }
        public string SetCorrectAnswer(DTO.QuestionAnswers CorrectAnswer)
        {
            DAO.Question _Question = m_QuestionManagement.GetQuestion(CorrectAnswer.QuestionId);
            DAO.Answer   _Answer   = m_AnswerManagement.GetAnswer(CorrectAnswer.AnswerId);

            m_QuestionManagement.SetCorrectAnswer(_Question, _Answer);
            return(string.Empty);
        }
        public string GetAllQuestions(string FilterName)
        {
            // Получить список вопросов.
            var _DaoQuestions = m_QuestionManagement.GetAllQuestions(string.Empty);

            // Получить список ответов на вопросы.
            List <DTO.Question> _DtoQuestions = new List <DTO.Question>();

            foreach (var _DaoQuestion in _DaoQuestions)
            {
                // Вопрос.
                var _DtoQuestion = new DTO.Question()
                {
                    Id = _DaoQuestion.Id, Text = _DaoQuestion.Text
                };
                // Ответы.
                foreach (var _DaoAnswers in _DaoQuestion.Answers)
                {
                    DTO.QuestionAnswers _DtoAnswer = new DTO.QuestionAnswers()
                    {
                        QuestionId = _DaoAnswers.QuestionId,
                        AnswerId   = _DaoAnswers.Answer.Id,
                        AnswerText = _DaoAnswers.Answer.Text,
                        IsCorrect  = _DaoAnswers.IsCorrect
                    };

                    _DtoQuestion.Answers.Add(_DtoAnswer);
                }

                _DtoQuestions.Add(_DtoQuestion);
            }

            string _Json = Utils.JsonSerialize(_DtoQuestions);

            return(_Json);
        }