i got access token but i can't get data

[GoogleCodeExporter]

I'm trying upload photo to picasa 
i use this C# code 

I'm successfully get access token , but when i use it with 
-----------
                authFactory.Token = googleRespnse.access_token;
                PicasaService service = new PicasaService(authFactory.ApplicationName);
                service.RequestFactory = authFactory;
------------
i got error message

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Script.Serialization;
using Google.GData.Client;
using Google.Picasa;
using Google.GData.Photos;
using System.Net;
using System.IO;

public partial class _2gplus_move_auth_goauth : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string GKey = System.Configuration.ConfigurationManager.AppSettings["GKey"];
        string GSecret = System.Configuration.ConfigurationManager.AppSettings["GSecret"];
        string scop = "http://picasaweb.google.com/data/feed/api/user/default/";
        string next = System.Configuration.ConfigurationManager.AppSettings["GMyWebSite"] + System.Configuration.ConfigurationManager.AppSettings["GPostAuthorizeRedirectURL"];

        if ((Request["token"] == null) && (Request["error"] == null) && (Request["fromfb"]=="ok"))
        {

            string Url = string.Format("https://accounts.google.com/o/oauth2/auth?client_id={0}&redirect_uri={1}&scope={2}&response_type=code", GKey, next, scop);
            Response.Redirect(Url);

        }
        else if((Page.Request.QueryString["goauth"] != null) && (Page.Request.QueryString["goauth"] == "ok")) //if (Request["goauth"] == "ok")
        {
            if ((Page.Request.QueryString["code"] != null) && (Page.Request.QueryString["code"] != ""))
            {
                string code = Page.Request.QueryString["code"];
                string link = string.Format("https://accounts.google.com/o/oauth2/token");
                string parm = string.Format("client_id={0}&client_secret={1}&redirect_uri={2}&code={3}&grant_type=authorization_code", GKey, GSecret, next, code);
                string response = webFetch(link, parm);

                JavaScriptSerializer js = new JavaScriptSerializer();
                GooGleRespnse googleRespnse=js.Deserialize<GooGleRespnse>(response);

                GAuthSubRequestFactory authFactory = new GAuthSubRequestFactory("lh2","exampleCo-exampleApp-1");
                authFactory.Token = googleRespnse.access_token;
                PicasaService service = new PicasaService(authFactory.ApplicationName);
                service.RequestFactory = authFactory;

                string username = "default";
                AlbumEntry newEntry = new AlbumEntry();
                newEntry.Title.Text = "New album";
                newEntry.Summary.Text = "This is an album";
                AlbumAccessor ac = new AlbumAccessor(newEntry);
                ac.Access = "public";

                Uri feedUri = new Uri(PicasaQuery.CreatePicasaUri(username));

                PicasaEntry createdEntry = (PicasaEntry)service.Insert(feedUri, newEntry);

            }
            else
            {
                Server.Transfer("gonotoauth.aspx");
            }
            Session["google_access_token"] = Request["access_token"];

        }
    }

    private string webFetch(string link, string parameter)
    {
        string responseFromServer = "";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(link);
        request.Method = "POST";
        byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(parameter);

        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = byteArray.Length;
        Stream dataStream = request.GetRequestStream();
        dataStream.Write(byteArray, 0, byteArray.Length);
        dataStream.Close();

        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        if (HttpStatusCode.OK == response.StatusCode)
        {
            dataStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(dataStream);
            responseFromServer = reader.ReadToEnd();
            response.Close();
        }

        return responseFromServer;
    }
    class GooGleRespnse
    {
        public string access_token  {get;set;}
        public string expires_in    { get; set; }
        public string refresh_token { get; set; }
    }
}

Original issue reported on code.google.com by tareqcc...@gmail.com on 21 Jul 2011 at 1:35

Attachments:

• goauth.cs

[GoogleCodeExporter]

I might not be understanding your question, but I don't see how this GWT OAuth 
2.0 library has anything to do with failed access in a C# app?

Also, it looks like you're using the access token to get data from the Picasa 
GData API, which doesn't support OAuth 2.0, just OAuth 1.0a.

Original comment by jasonhall@google.com on 21 Jul 2011 at 3:04

• Changed state: Invalid