public ActionResult Login(LoginModel model, string returnUrl)
        {
            if (ModelState.IsValid && WebSecurity.Login(model.Email, model.Password, persistCookie: model.RememberMe))
            {
                var roles = (SimpleRoleProvider)Roles.Provider;
                if (!roles.GetRolesForUser(model.Email).Contains("Admin"))
                {
                    ModelState.AddModelError("", "You are not an Admin, invalid credentials.");
                    return View(model);
                }

                return RedirectToLocal(returnUrl);
            }

            // If we got this far, something failed, redisplay form
            ModelState.AddModelError("", "The user name or password provided is incorrect.");
            return View(model);
        }
        public ActionResult Login(LoginModel model, string returnUrl)
        {
            if (ModelState.IsValid && WebSecurity.Login(model.Email, model.Password, persistCookie: model.RememberMe))
            {
                return Json(new
                {
                    success = true,
                    url = returnUrl
                });
            }

            // If we got this far, something failed, redisplay form
            ModelState.AddModelError("", "The user name or password provided is incorrect.");
            return Json(new
            {
                success = false,
                errors = ModelState.Keys.SelectMany(k => ModelState[k].Errors).Select(m => m.ErrorMessage).ToArray()
            });
        }