public ActionResult Add(User u) { if (u != null) { if (iuser.InsertUser(u) == true) { if (Session["UserID"] == null) { Session["UserID"] = u.ID; Session["UserName"] = u.UserName; Session["Admin"] = u.IsAdmin; } iuser.Commit(); } else { ViewBag.DuplicateMessage = "username already exists"; return(View(u)); } } return(RedirectToAction("Index")); }