public ActionResult Index(string SearchString, string currentFilter, string numberPerPage, string submit, int? page)
    {
        int pageSize = string.IsNullOrEmpty(numberPerPage) ? 10 : Int32.Parse(numberPerPage);
        int pageNumber = (page ?? 1);

        var CohortList = from s in db.Cohorts select s;
        if (((!string.IsNullOrEmpty(SearchString)) || (!string.IsNullOrEmpty(currentFilter))) && (!string.IsNullOrEmpty(submit)))
        {
            if (SearchString != null)
            {
                page = 1;
            }
            else
            {
                SearchString = currentFilter;
            }
            ViewBag.CurrentFilter = SearchString;
            ViewBag.numberPerPage = numberPerPage;
            switch (submit)
            {
                case "conceptSearch":
                    var conceptResults = CohortList.Where(s => s.Overview.Contains(SearchString)).OrderBy(s => s.Name);
                    if (conceptResults.Count() > 0)
                    {
                        ViewBag.searchTerm = SearchString;
                        ViewBag.submit = submit;
                        return View(conceptResults.ToPagedList(pageNumber, pageSize));
                    }
                    else
                    {
                        ViewBag.searchTerm = SearchString;
                        ViewBag.submit = submit;
                        return View(conceptResults.ToPagedList(pageNumber, pageSize));
                    }
                    //break;
                case "textSearch":
                    var textResults = CohortList.Where(s => s.Overview.Contains(SearchString)).OrderBy(s => s.Name);
                    if (textResults.Count() > 0)
                    {
                        ViewBag.searchTerm = SearchString;
                        ViewBag.submit = submit;
                        return View(textResults.ToPagedList(pageNumber, pageSize));
                    }
                    else
                    {
                        ViewBag.searchTerm = SearchString;
                        ViewBag.submit = submit;
                        return View(textResults.ToPagedList(pageNumber, pageSize));
                    }
                    //break;
            }
        }
        return View(CohortList.ToPagedList(pageNumber, pageSize));
    }