public ActionResult Index(User user)
        {
            if (ModelState.IsValid)
            {

                if (user.loginUser(user))
                {
                    String loginName = user.username;
                    String account = user.accountType.ToString();
                    String loggedIn = user.loggedIn.ToString();

                    //Store in session
                    Session["loginName"] = loginName;
                    Session["account"] = account;
                    Session["loggedIn"] = loggedIn;

                    return RedirectToAction("Index", "Store");
                }

                else
                {

                    ModelState.AddModelError("", "The user name or password provided is incorrect." );
                    return View(user);
                }
            }else
            {

                return View(user);
            }
        }