public IActionResult AddFeedbackConfirmed(int id, SessionUserViewModel svm)
        {
            try {
                User user = UserService.GetByUsername(User.Identity.Name);
                SessionService.AddFeedback(id, user, svm.FeedbackText);
                TempData["feedback"] = "Wij hebben je feedback goed ontvangen en zullen ze zo snel mogelijk verwerken.";
            } catch (Exception e) {
                Console.WriteLine(e);
                TempData["error"] = e.Message;
            }

            return(RedirectToAction(nameof(Details), new { id }));
        }