private bool GB_Login(string username, string password)
{
    string url = "https://www.google.com/accounts/ServiceLoginAuth";

    HttpWebRequest req;

    req = (HttpWebRequest)HttpWebRequest.Create(url);

    req.AllowAutoRedirect = true;
    req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)";
    req.CookieContainer = CookieCont;
    req.Accept = "*";
    req.Method = "POST";
    req.ContentType = "application/x-www-form-urlencoded";

    StringBuilder postData = new StringBuilder();
    postData.AppendFormat("{0}={1}&", "service", "bookmarks");
    postData.AppendFormat("{0}={1}&", "nui", "1");
    postData.AppendFormat("{0}={1}&", "hl", "en");
    postData.AppendFormat("{0}={1}&", "Email", username);
    postData.AppendFormat("{0}={1}&", "Passwd", password);
    postData.AppendFormat("{0}={1}&", "PersistentCookie", "yes");
    postData.AppendFormat("{0}={1}&", "rmShown", "1");
    postData.AppendFormat("{0}={1}&", "continue", 
    "http://www.google.com/bookmarks/lookup%3Foutput%3Dxml%26num%3D10000");

    byte[] postDataBytes = Encoding.UTF8.GetBytes(postData.ToString());

    req.ContentLength = postDataBytes.Length;

    Stream postDataStream = req.GetRequestStream();
    postDataStream.Write(postDataBytes, 0, postDataBytes.Length);
    postDataStream.Close();

    HttpWebResponse resp;

    resp = (HttpWebResponse)req.GetResponse();

    Stream rcvStream = resp.GetResponseStream();
    byte[] respBytes = new byte[8192];
    int byteCount;
    StringBuilder wText = new StringBuilder();

    do
    {
        byteCount = rcvStream.Read(respBytes, 0, 8192);
        wText.Append(Encoding.ASCII.GetString(respBytes));
    } 
    while (byteCount > 0);

    resp.Close();
    rcvStream.Close();

    return true;
}