private readonly LoginDemoEntities _context;

        public LoginController()
        {
            _context = new LoginDemoEntities();
        }

        public ActionResult Index()
        {
            // This is just to check that session is destryed and logout is successfull
            var user = Session["User"];

            SetMesssages();

            var loginViewModel = new LoginViewModel();
            return View(loginViewModel);
        }

        private void SetMesssages()
        {
            if (TempData["SuccessMessage"] != null)
            {
                ViewBag.SuccessMessage = TempData["SuccessMessage"];
            }

            if (TempData["ErrorMessage"] != null)
            {
                ViewBag.ErrorMessage = TempData["ErrorMessage"];
            }
        }

        [HttpPost]
        public ActionResult Index(LoginViewModel model)
        {
            var user = _context.UserMasters
                .FirstOrDefault(m => m.Email.Equals(model.Email) && m.Password.Equals(model.Password));

            // if the user is null then login unsuccessful
            if (user == null)
            {
                TempData["ErrorMessage"] = "Invalid email or password.";
                return RedirectToAction("Index");
            }
            else
            {
                Session["User"] = user;
                return RedirectToAction("Index", "Home");
            }
        }

        public ActionResult Registration()
        {
            SetMesssages();
            var registrationViewModel = new RegistrationViewModel();
            return View(registrationViewModel);
        }

        [HttpPost]
        public ActionResult Registration(RegistrationViewModel model)
        {
            if (ModelState.IsValid)
            {
                var userMaster = new UserMaster
                {
                    Name = model.Name,
                    Email = model.Email,
                    Password = model.Password
                };

                try
                {
                    _context.UserMasters.Add(userMaster);
                    _context.SaveChanges();

                    TempData["SuccessMessage"] = "User created successfully. Please login!";
                    return RedirectToAction("Index");
                }
                catch (Exception ex)
                {
                    TempData["ErrorMessage"] = "Something went wrong! " + ex.Message;
                    return RedirectToAction("Registration");
                }
            }
            return View("Registration");
        }

        public ActionResult Logout()
        {
            if (Session["User"] != null)
            {
                // Session.Timeout = 1000; // You just need to fihure out where to put this
                Session["User"] = null;
                Session.Abandon();
            }

            return RedirectToAction("Index");
        }


     [Required]
        [DataType(DataType.EmailAddress)]
        [EmailAddress]
        public string Email { get; set; }

        [Required]
        public string Password { get; set; }


[Required]
        [StringLength(50)]
        public string Name { get; set; }

        [Required]
        [StringLength(50)]
        [EmailAddress]
        public string Email { get; set; }

        [Required]
        [StringLength(15)]
        public string Password { get; set; }

        [Required]
        [Compare("Password")]
        public string ConfirmPassword { get; set; }

BaseController

  protected override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if(Session["User"] == null)
            {
                filterContext.Result = RedirectToAction("Index","Login");
            }

            base.OnActionExecuting(filterContext);
        }