Question

I have the following LogOn Action
[HttpPost]

     public ActionResult LogOn(LogOnModel user, string returnUrl)
        {
  if (!String.IsNullOrEmpty(returnUrl))
                                {
                    return Redirect(returnUrl);
                }
                else
                {
                    return RedirectToAction("Index", "Home");
                }
}

In which My returnUrl is null..
Can any body tell me .Why my return URL is null

Answer 1

That’s depends how you call the controller action method.

1. If you have an URL like below
   http://www.somedomain.com/LogOn/LogOn?returnUrl=user/userList

   In this call, your returnUrl parameter of an ActionMethod (LogOn will be replaced by querystring parameter returnUrl.

2. If you’re using form authentication, there is an [Authorize] attribute which validated the authentication. If user is NOT authenticated, then it will redirect to the LogIn page with the querystring parameter returnUrl which will have a requested page url in it.

At this moment, you will also get returnUrl value in controller’s action method parameter with returnUrl paramter with value which will have requested page Url

Hope this helps!