RedirectToAction usage in asp.net mvc

Question

I want to post some questions about ASP.Net MVC. I am not familiar with web developing, But I was assigned to the web part of a project. We are doing the follow

Answer 1

If you don't want the parameter to be shown in the address bar you will need to persist it somewhere on the server between the redirects. A good place to achieve this is TempData. Here's an example:

public ActionResult Index()
{
    TempData["nickname"] = Person.nickname;
    return RedirectToAction("profile", "person");
}

And now on the Profile action you are redirecting to fetch it from TempData:

public ActionResult Profile()
{
    var nickname = TempData["nickname"] as string;
    if (nickname == null)
    {
        // nickname was not found in TempData.
        // this usually means that the user directly
        // navigated to /person/profile without passing
        // through the other action which would store
        // the nickname in TempData
        throw new HttpException(404);
    }
    return View();
}

Under the covers TempData uses Session for storage but it will be automatically evicted after the redirect, so the value could be used only once which is what you need: store, redirect, fetch.