public void Load(long CategoryId)
        {
            ShowCategory = CategoryId == 0;

            var questions = CategoryId == 0
                ? _surveyRepository.GetAllQuestions()
                : _surveyRepository.GetQuestionByCategory(CategoryId);

            Items = questions.Select(q => new TestQuestionDto
            {
                QuestionId       = q.Id,
                Question         = q.Question,
                QuestionCategory = q.Category.Name
            })
                    .ToList();
        }