public static void ResetCurrentUserSession(string userName = null)
        {
            if (string.IsNullOrEmpty(userName))
            {
                userName = System.Web.HttpContext.Current.User.Identity.Name;
            }

            using (var db = new MyUtubeEntities())
            {
                var user = db.Users.FirstOrDefault(n => n.Username == userName);
                if (user == null)
                {
                    return;
                }
                CurrentSession.CurrentUser = user;
            }
        }
        public ActionResult Login(LoginViewModel model)
        {
            //check in the database compare if the model.Username is same in the database

            using (var db = new MyUtubeEntities())
            {
                var exituser = db.Users.Where(x => x.Username == model.Username && x.Password == model.Password).FirstOrDefault();

                if (exituser == null)
                {
                    ViewBag.IncorrectLogin = "******";
                    return(View());
                }
                else
                {  // set cookie
                    FormsAuthentication.SetAuthCookie(model.Username, true);
                    // reset currentusersession
                    ResetCurrentUserSession(model.Username);
                    //redirect home index page
                    return(RedirectToAction("Index", "Home"));
                }
            }
        }