public async Task <IActionResult> Detail(string id)
        {
            var userId = await _userManager.FindByNameAsync(User.Identity.Name);

            int user = userId.Id;
            var veri = _tasksManager.GetDetailTask(id, user);

            Tasks bitistarihi = new Tasks();

            foreach (var item in veri)
            {
                bitistarihi.FinishDate = item.FinishDate;
            }
            var a = bitistarihi.FinishDate.ToString("dd MM yyyy");

            var kalansure = Convert.ToDateTime(a) - DateTime.Now.Date;
            var gun       = kalansure.TotalDays;

            ViewBag.kalangun = gun;

            ViewBag.detail = veri;


            return(View());
        }