public ActionResult BuyTicket(long id)
        {
            Ticket ticket = new TicketBuilder()
                            .SetEventId(id)
                            .Build();

            if (TempData["user"] != null)
            {
                var    userJson = JsonConvert.DeserializeObject(TempData["user"].ToString());
                JToken token    = JObject.Parse(userJson.ToString());
                ticket.SetUserId((long)token.SelectToken("Id"));
                User user = new UserBuilder()
                            .SetId((long)token.SelectToken("Id"))
                            .SetUsername((string)token.SelectToken("Username"))
                            .Build();
                TempData["user"] = JsonConvert.SerializeObject(user);
            }
            if (ticket.GetUserId() == 0)
            {
                return(StatusCode(404));
            }
            ticketService.CreateTicket(ticket);
            return(RedirectToAction("UserTickets"));
        }