Error getting an access token for c# webforms using facebook c# sdk

Question

I've searched through atleast 100 hundred access token issues but have not found an solution for my issue. I am using the facebook sdk to auth but when I try to simple .Get on "me" it errors out with this error: "(OAuthException) An active access token must be used to query information about the current user." I am using .NET 3.5 framework so I can not use 'dynamic'. When I substitute a valid id where "me" it works and shows the name. When I try to post to feed I get the "(OAuthException) (#200) The user hasn't authorized the application to perform this action." Any help would be great. Thanks.

Here is my code:

        var webRequest = (HttpWebRequest)HttpWebRequest.Create("https://graph.facebook.com/oauth/access_token");
        webRequest.Method = "POST";
        webRequest.ContentType = "application/x-www-form-urlencoded";

        var requestString = "client_id=[appid]&client_secret=[secret]&redirect_uri=http%3A%2F%2Fwww.website.com&grant_type=client_credentials&scope=publish_stream,read_stream,offline_access";

        byte[] bytedata = Encoding.UTF8.GetBytes(requestString);
        webRequest.ContentLength = bytedata.Length;

        var requestStream = webRequest.GetRequestStream();
        requestStream.Write(bytedata, 0, bytedata.Length);
        requestStream.Close();

        var response = webRequest.GetResponse();
        var responseStream = new StreamReader(response.GetResponseStream());
        var responseString = responseStream.ReadToEnd();

        responseStream.Close();
        response.Close();

        if (!String.IsNullOrEmpty(responseString))
        {
            var accessToken = responseString.Replace("access_token=", "");
            var fb = new FacebookWebClient(accessToken.ToString());
            var me = fb.Get<FBUser>("100000219214008");
            string firstName = me.name;
            var postparameters = new Dictionary<string, object>();
            postparameters["message"] = "Hello world!";
            postparameters["name"] = "This is a name";
            postparameters["link"] = "http://thisisalink.com";
            postparameters["description"] = "This is a description";
            var result = fb.Post("/100000219214008/feed", postparameters); 
            Response.Write (firstName.ToString());
        }

Answer 1

After struggling for days with the Facebook C# SDK, I chose to go with the Facebook Javascript SDK. This SDK has wide support, examples and documentation although it is client-side. It just works.