Redirect a user to the page they were previously on after they login (.NET, C#)

AccountController.cs

private ActionResult RedirectToLocal(string returnUrl)
{
    string hostUrl = Request.Url.Scheme + "://" + Request.UrlReferrer.Authority;

    if (Url.IsLocalUrl(returnUrl))
    {
        return Redirect(hostUrl + returnUrl);
    }
    return RedirectToAction("Index", "Home");
}