public ActionResult AjaxAddStudent(Student student)
        {
            studManager.InsertStudent(student);

            var model = new StudentGroupsAdd();

            model.Students = studManager.GetStudents();
            return(Json(model.Students));
        }
        // GET: Groups
        public ActionResult Index()
        {
            //var students = studManager.GetStudents();

            var model = new StudentGroupsAdd();

            model.Students = studManager.GetStudents();
            model.Groups   = groupManager.GetGroups().ToList();
            return(View(model));
        }