public ActionResult IsReading(int id)
        {
            ApplicationUser user = Session["User"] as ApplicationUser;

            SqlQueries.AddIdToMaterialTextDatabase(user.UserName, id);
            var material = (MaterialText)Session["TextReading"];

            SetPXLevel(5);
            ViewBag.IsReading = true;
            return(View("TextReading", material));
        }