public ActionResult Index()
        {
            var model = new Configuration
            {
                Mail        = ConfigurationManager.AppSettings["Mail"],
                Phone       = ConfigurationManager.AppSettings["Phone"],
                Facebook    = ConfigurationManager.AppSettings["Facebook"],
                Twitter     = ConfigurationManager.AppSettings["Twitter"],
                Github      = ConfigurationManager.AppSettings["Github"],
                Instagram   = ConfigurationManager.AppSettings["Instagram"],
                Address     = ConfigurationManager.AppSettings["Address"],
                OpeningTime = ConfigurationManager.AppSettings["OpeningTime"]
            };

            return(View(model));
        }
        public ActionResult Update(Configuration configuration)
        {
            var config = WebConfigurationManager.OpenWebConfiguration("~");

            config.AppSettings.Settings["Mail"].Value        = configuration.Mail;
            config.AppSettings.Settings["Phone"].Value       = configuration.Phone;
            config.AppSettings.Settings["Facebook"].Value    = configuration.Facebook;
            config.AppSettings.Settings["Twitter"].Value     = configuration.Twitter;
            config.AppSettings.Settings["Github"].Value      = configuration.Github;
            config.AppSettings.Settings["Instagram"].Value   = configuration.Instagram;
            config.AppSettings.Settings["Address"].Value     = configuration.Address;
            config.AppSettings.Settings["OpeningTime"].Value = configuration.OpeningTime;

            config.Save(ConfigurationSaveMode.Modified);

            TempData["SaveSuccess"] = "true";
            return(RedirectToAction("index"));
        }