public ActionResult AddUsersToExam(FormCollection fm)
        {
            var selectedusers = fm["SelectedUsers"];
            var examId        = int.Parse(fm["ExamId"]);
            var exam          = _examinationRepository.GetExaminationData(examId);
            var preSelected   = exam.Members.ToList();

            if (preSelected.Any())
            {
                _examinationRepository.DetachMembersFromExam(examId);
            }
            if (selectedusers.Length > 1)
            {
                _examinationRepository.AttachMembersToExam(selectedusers, examId);
            }


            TempData["notification"] = "The Users have been successfully added/detached";
            return(RedirectToAction("AddUsersToExam", new { examId }));
        }