public virtual ActionResult LogOn(LogOnViewModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                var userName = membershipService.GetUserNameByEmail(model.UserName);

                if (userName == null)
                {
                    userName = model.UserName;
                }

                var user = membershipService.GetUser(userName);

                bool configLoadProblem = false;

                if (authenticationService.LogOn(userName, model.Password, model.RememberMe))
                {
                    if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/") &&
                        !returnUrl.StartsWith("//") && !returnUrl.StartsWith("/\\"))
                    {
                        return(Redirect(returnUrl));
                    }

                    configLoadProblem = SessionContainer.Create(user) == null;

                    if (!configLoadProblem)
                    {
                        return(RedirectToAction("Index", "LandingPage/Dashboard"));
                    }
                }

                if (configLoadProblem)
                {
                    ModelState.AddModelError("", "There was a problem loading the configuration for this user account.");
                }
                else
                {
                    if (user == null)
                    {
                        ModelState.AddModelError("", "This account does not exist. Please try again.");
                    }
                    else
                    {
                        if (!user.IsApproved)
                        {
                            ModelState.AddModelError("", "Your account has not been approved yet.");
                        }
                        else if (user.IsLockedOut)
                        {
                            ModelState.AddModelError("", "Your account is currently locked.");
                        }
                        else
                        {
                            ModelState.AddModelError("", "The user name or password provided is incorrect.");
                        }
                    }
                }
            }

            // If we got this far, something failed, redisplay form
            return(RedirectToAction("LogOn"));
        }