public JsonResult JsonLogin(LoginModel model, string returnUrl)
        {
            if (ModelState.IsValid)
              {
            if (Membership.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() });
        }
        public ActionResult Login(LoginModel model, string returnUrl)
        {
            if (ModelState.IsValid)
              {
            if (Membership.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);
        }