Trying to get to a page via an email link. Could the sitemap be stopping this?

I had this working.  I would email a link to a page (i.e. Work.aspx), and using the code below, the user would be routed to the login page and then sent  to Work.aspx after logging in.
But since I added a site map this isn't working.  I always go directly to my home page.  If I set Work.aspx as my start page in VS it works, but not if I click a link in the email.
Any thoughts?




 protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.User.Identity.IsAuthenticated)
            Response.Redirect("~/Login.aspx" + "?ReturnUrl=~/Work.aspx");
    }


    protected void Page_Load(object sender, EventArgs ...