// GET: StudentController/Create
        public async Task <ActionResult> Create()
        {
            var groups = await groupService.ActivesAsync();

            var groupsView = groups.Select(g => mapper.Map <GroupViewModel>(g));

            ViewBag.Groups = new SelectList(groups, "Id", "Name");
            return(View());
        }
        // GET: GroupController
        public async Task <ActionResult> Index()
        {
            var groups = await groupService.ActivesAsync();

            var groupsView = groups.Select(g => mapper.Map <GroupViewModel>(g));

            return(View(groupsView));
        }