public async Task <IActionResult> Index()
        {
            var access_token = CookieEncoder.DecodeToken(Request.Cookies["access_token_cookie"]);
            var users        = await _userManage.GetNumberOfUsers(access_token);

            var categories = await _cateManage.GetAll();

            var exams = await _examManage.GetAll(access_token);

            var questions = await _quesManage.GetNumberQuestion(access_token);

            ViewBag.TotalExam     = exams.data.Count();
            ViewBag.TotalQuestion = questions.data;
            if (users != null && categories != null)
            {
                if (users.msg != null)
                {
                    ViewBag.Error = users.msg;
                }
                ViewBag.TotalUser     = users.data;
                ViewBag.TotalCategory = categories.data.Count;
            }
            return(View());
        }