public async Task <ActionResult> Login(LoginViewModel model, string returnUrl)
        {
            try
            {
                var dbOps = new DatabaseOperations();

                if (dbOps.AccountIsDisabled(model.Email))
                {
                    ViewBag.Failure = "Account is disabled";

                    return(View(model));
                }

                if (!ModelState.IsValid)
                {
                    return(View(model));
                }
            }
            catch (SqlException)
            {
                throw;
            }
            catch (WebException)
            {
                throw;
            }

            // This doesn't count login failures towards account lockout
            // To enable password failures to trigger account lockout, change to shouldLockout: true
            var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, shouldLockout : false);

            switch (result)
            {
            case SignInStatus.Success:
                return(RedirectToAction("Index", "Books"));

            case SignInStatus.LockedOut:
                return(View("Lockout"));

            case SignInStatus.RequiresVerification:
                return(RedirectToAction("SendCode", new { ReturnUrl = returnUrl, RememberMe = model.RememberMe }));

            case SignInStatus.Failure:
            default:
                ModelState.AddModelError("", "Invalid login attempt.");
                return(View(model));
            }
        }