I am trying to login to the TV Rage website and get the source code of the My Shows page. I am successfully logging in (I have checked the response from my post request) but then when I try to perform a get request on the My Shows page, I am re-directed to the login page.

This is the code I am using to login:

    private string LoginToTvRage()
    {
        string loginUrl = "http://www.tvrage.com/login.php";
        string formParams = string.Format("login_name={0}&login_pass={1}", "xxx", "xxxx");
        string cookieHeader;
        WebRequest req = WebRequest.Create(loginUrl);
        req.ContentType = "application/x-www-form-urlencoded";
        req.Method = "POST";
        byte[] bytes = Encoding.ASCII.GetBytes(formParams);
        req.ContentLength = bytes.Length;
        using (Stream os = req.GetRequestStream())
        {
            os.Write(bytes, 0, bytes.Length);
        }
        WebResponse resp = req.GetResponse();
        cookieHeader = resp.Headers["Set-cookie"];
        String responseStream;
        using (StreamReader sr = new StreamReader(resp.GetResponseStream()))
        {
            responseStream = sr.ReadToEnd();
        }
        return cookieHeader;
    }

I then pass the cookieHeader into this method which should be getting the source of the My Shows page:

    private string GetSourceForMyShowsPage(string cookieHeader)
    {
        string pageSource;
        string getUrl = "http://www.tvrage.com/mytvrage.php?page=myshows";
        WebRequest getRequest = WebRequest.Create(getUrl);
        getRequest.Headers.Add("Cookie", cookieHeader);
        WebResponse getResponse = getRequest.GetResponse();
        using (StreamReader sr = new StreamReader(getResponse.GetResponseStream()))
        {
            pageSource = sr.ReadToEnd();
        }
        return pageSource;
    }

I have been using this previous question as a guide but I'm at a loss as to why my code isn't working.