public async Task <IActionResult> Index()
        {
            var currentUser = await _userManager.GetUserAsync(User);

            if (currentUser == null)
            {
                return(Challenge());
            }
            var items = await _taskItemService.GetIncompleteItemsAsync(currentUser);

            var model = new TaskItemViewModel()
            {
                Items = items
            };

            return(View(model));
        }