insert update delete shared contacts using domain shared contacts api

[foram]

Hello everyone,

Plz plz plz help me.I am having hard time in using google shared contacts api.

I am using .net C#.

below step i am using

1 ) create link which redirects to :https://www.google.com/accounts/AuthSubRequest?scope=https%3A%2F%2Fwww.google.com%2Fm8%2Ffeeds%2F&session=1&secure=0&hd=mydomain.org&next=http%3A%2F%2Flocalhost:53061/Googlecontacts/Default4.aspx

after this click i am able to redirect google page where i am giving my user name and password and after htting grant access I am able to get token which i am using to authorized it.

2) in defautl4.aspx page load

if (!IsPostBack)

        {            

            String token = Request.QueryString["token"];

            Session["token"] = token;

            HttpWebResponse response = null;

            string authSubToken = "";

            string sessionUrl = getSessionTokenUrl("https", "www.google.com");

            Uri uri = new Uri(sessionUrl);

            HttpWebRequest request = WebRequest.Create(uri) as HttpWebRequest;

             Session["header"] = formAuthorizationHeader(Session["token"].ToString(), null, uri, "GET");

             request.Headers.Add(Session["header"].ToString());

             request.Headers.Add("GData-Version: 3.0");

            response = request.GetResponse() as HttpWebResponse;

            if (response != null)

            {

                int code = (int)response.StatusCode;

                if (code != 200)

                {

                }

                // get the body and parse it

                authSubToken = Utilities.ParseValueFormStream(response.GetResponseStream(), GoogleAuthentication.AuthSubToken);

            }

            Session["newtoken"]= authSubToken;

        }

 public static string getSessionTokenUrl(string protocol, string domain)

    {

        return protocol + "://" + domain + "/accounts/AuthSubSessionToken";

    }

So here i am getting 200 as status code so i am gussing that I have authorized it sucessfully.

3) after authorizing token i want to retrieve all shared contacts not personal contacts. so i am making another request 

 HttpWebResponse response = null;

       // string sessionUrl = "https://www.google.com/m8/feeds/contacts/watershedhealth/full";

        string sessionUrl = getSessionTokenUrlcontact("https", "www.google.com");

        Uri uri = new Uri(sessionUrl);

        HttpWebRequest request = HttpWebRequest.Create(uri) as HttpWebRequest;

        string header = formAuthorizationHeader(Session["newtoken"].ToString(), null, uri, "GET");

        request.Headers.Add(header);

        request.ContentType = "application/x-www-form-urlencoded";

        request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)";

        request.Host = "www.google.com";

        request.Accept = "text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2";

        request.KeepAlive = true;

        request.Method = "GET";       

               //request.Headers.Add(Session["header"].ToString());        

       response = request.GetResponse() as HttpWebResponse;

  public static string getSessionTokenUrlcontact(string protocol, string domain)

    {

        return protocol + "://" + domain + "/m8/feeds/contacts/mydomain.org/full";

    }

So here i am getting error some time 403 or sometime unauthorize 401.

if i change it mydomain.org by default I am getting all personal contacts but i want to retrieve all shared contacts not personal.

I am following https://developers.google.com/google-apps/domain-shared-contacts/ .

Plz plz plz help what i am missing above?

Thanks

Foram