public ActionResult Book(int?page)
        {
            userID = User.Identity.GetUserId();
            bool isAdmin = User.IsInRole("Admin");

            int pageSize   = 20;
            int count      = CaseRepository.GetBookCases(userID, isAdmin).Count();
            int numOfPages = count / pageSize + (count % pageSize > 0 ? 1 : 0);

            page = page ?? 1;
            if (page < 1)
            {
                page = 1;
            }
            if (page > numOfPages)
            {
                page = numOfPages;
            }

            int startIndex = ((int)page - 1) * pageSize;

            var cases = CaseRepository.GetBookCases(userID, isAdmin)
                        .OrderBy(c => c.Id)
                        .Skip(startIndex)
                        .Take(pageSize)
                        .ToList();

            ViewBag.NumOfPages  = numOfPages;
            ViewBag.CurrentPage = page;

            return(View(cases));
        }