public ActionResult Login(LoginModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                if (_membershipProvider.ValidateUser(model.UserName, model.Password))
                {
                    FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                    if (Url.IsLocalUrl(returnUrl))
                    {
                        return Redirect(returnUrl);
                    }
                    else
                    {
                        return RedirectToAction("Index", "Home");
                    }
                }
                else
                {
                    ModelState.AddModelError("", "The user name or password provided is incorrect.");
                }
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }
        public JsonResult JsonLogin(LoginModel model, string returnUrl)
        {
            if (ModelState.IsValid)
            {
                if (_membershipProvider.ValidateUser(model.UserName, model.Password))
                {
                    FormsAuthentication.SetAuthCookie(model.UserName, model.RememberMe);
                    return Json(new { success = true, redirect = returnUrl });
                }
                else
                {
                    ModelState.AddModelError("", "The user name or password provided is incorrect.");
                }
            }

            // If we got this far, something failed
            return Json(new { errors = GetErrorsFromModelState() });
        }