Hjälp med att integrera sig med facebook (C#)

private void CheckAuthorization()
        {
            string app_id = "x";
            string app_secret = "x";
            string scope = "publish_actions";

            if (Request["code"] == null)
            {
                Response.Redirect(string.Format(
                    "https://graph.facebook.com/oauth/authorize?client_id={0}&redi...",
                    app_id, Request.Url.AbsoluteUri, scope));
            }
            else
            {
                Dictionary<string, string> tokens = new Dictionary<string, string>();

                string url = string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&r...",
                    app_id, Request.Url.AbsoluteUri, scope, Request["code"].ToString(), app_secret);

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

                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                {
                    StreamReader reader = new StreamReader(response.GetResponseStream());

                    string vals = reader.ReadToEnd();

                    foreach (string token in vals.Split('&'))
                    {
                        tokens.Add(token.Substring(0, token.IndexOf("=")),
                            token.Substring(token.IndexOf("=") + 1, token.Length - token.IndexOf("=") - 1));
                    }
                }

                string access_token = tokens["access_token"];

                var client = new FacebookClient(access_token);


                var args = new Dictionary<string, object>();
                args["message"] = "abc";
                args["caption"] = "This is caption!";
                args["description"] = "This is description!";
                args["name"] = "This is name!";
                args["picture"] = "url";
                args["link"] = "link";

                client.Post("/1418771281723422/feed", args);

            }
        }

client.Post("/1418771281723422/feed", args);

client.Post("/me/feed", args);