public ActionResult Login(LoginViewModel model, string returnUrl)
        {
            if (!ModelState.IsValid)
            {
                return View(model);
            }
            var data = new Data();
            var users = data.users();

            if (users.Any(p => p.user == model.UserName && p.password == model.Password))
            {
                var identity = new ClaimsIdentity(new[] { new Claim(ClaimTypes.Name, model.UserName),}, DefaultAuthenticationTypes.ApplicationCookie);

                Authentication.SignIn(new AuthenticationProperties
                {
                    IsPersistent = model.RememberMe
                }, identity);
                
                return RedirectToAction("Index", "Home");
            }
            else
            {
                ModelState.AddModelError("", "Invalid login attempt.");
                return View(model);
            }
        }
        // GET: Navbar
        public ActionResult Navbar(string controller, string action)
        {
            var data = new Data();

            var navbar = data.itemsPerUser(controller, action, User.Identity.Name);

            return PartialView("_navbar", navbar);
        }
        private bool Access(RouteData routeData, string userName)
        {
            var controllerName = routeData.Values["controller"].ToString();
            var actionName = routeData.Values["action"].ToString();
            
           var data = new Data();
           var items = data.navbarItems();
           var rolesNav = data.roles();
           var usersNav = data.users();

           var getAccess = (from nav in items
                            join rol in rolesNav on nav.Id equals rol.idMenu
                            join user in usersNav on rol.idUser equals user.Id
                            where user.user == userName && nav.controller == controllerName && nav.action == actionName
                            select user.Id).Single();

           var context = new ActionExecutingContext();

           if (getAccess != 0)
               return true;
           else
               return false;
        }