public async Task <IActionResult> Index(int page = 1)
        {
            var veri = await _tasksManager.GetAsync();

            var userId = await _userManager.FindByNameAsync(User.Identity.Name);

            int user = userId.Id;

            ViewBag.sure = veri;

            ViewBag.aktifsayfa = page;
            var gorevler = _tasksManager.GetActiveTasks(out int toplamsayfa, page, user);

            ViewBag.toplamsayfa = toplamsayfa;
            ViewBag.veriler     = gorevler;
            return(View());
        }