public JsonResult JsonLogOn(LogOnModel 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 LogOn(LogOnModel 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);
        }