public ActionResult Question(int deckId, int cardId, UserStatistic statistic)
        {
            var deck  = deckRepository.GetSingle(deckId);
            var model = new StudyDeckModel()
            {
                Deck      = deck,
                Card      = deck.Cards.Where(c => c.CardID == cardId).FirstOrDefault(),
                Statistic = statistic
            };

            return(View(model));
        }
        public ActionResult Finish(int deckId = 0)
        {
            if (deckId == 0)
            {
                return(HttpNotFound());
            }
            var model = new StudyDeckModel()
            {
                Deck      = deckRepository.GetSingle(deckId),
                Card      = null,
                Statistic = (UserStatistic)Session["statistic"]
            };

            return(View(model));
        }