public ActionResult Details(int ID)
        {
            string           userName = User.Identity.Name.Substring(0, User.Identity.Name.IndexOf("@")).ToLower();
            List <BookModel> books    = new List <BookModel>();

            books = BookProcessor.GetData(userName);

            BookModel specialBook = new BookModel();

            specialBook = books.Find(b => b.ID == ID);

            return(View(specialBook));
        }
        public ActionResult DisplayBook()
        {
            string           userName = User.Identity.Name.Substring(0, User.Identity.Name.IndexOf("@")).ToLower();
            List <BookModel> books    = new List <BookModel>();
            var data = BookProcessor.GetData(userName);

            foreach (BookModel row in data)
            {
                books.Add(new BookModel
                {
                    ID         = row.ID,
                    GegStdKurz = row.GegStdKurz,
                    Klasse     = row.Klasse,
                    Kurztitel  = row.Kurztitel,
                    Verlag     = row.Verlag,
                    Preis      = row.Preis,
                    LehrKurz   = row.LehrKurz
                });
            }
            return(View(books));
        }