HttpWebRequest Post callback

        public void GetValueFromRequest(string postData)
        {
            var request = (HttpWebRequest) WebRequest.CreateHttp("http://login.test.geoop.com/oauth2/token");

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

            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = requestBytes.Length;

            request.BeginGetRequestStream(GetRequestStreamCallback, request);
        }

        private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
        {
            var request = (HttpWebRequest) asynchronousResult.AsyncState;

            // End the operation
            var postStream = request.EndGetRequestStream(asynchronousResult);

            var postData = "grant_type=password&username=geooplive&password=geooppass&client_id=app4&scope=default";

            // Convert the string into a byte array.
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);

            // Write to the request stream.
            postStream.Write(byteArray, 0, postData.Length);
            postStream.Close();

            // Start the asynchronous operation to get the response
            request.BeginGetResponse(GetResponseCallback, request);
        }

        private static void GetResponseCallback(IAsyncResult asynchronousResult)
        {
            var request = (HttpWebRequest)asynchronousResult.AsyncState;
            HttpWebResponse response = null;

            // End the operation
            try
            {
                response = (HttpWebResponse) request.EndGetResponse(asynchronousResult);
            }
            catch (WebException ex)
            {
                if (ex.Response != null)
                {

                }
            }

            if (response.StatusCode == HttpStatusCode.Accepted)
            {
                Debug.WriteLine(response.ToString());
            }
            var streamResponse = response.GetResponseStream();
            var streamRead = new StreamReader(streamResponse);
            var responseString = streamRead.ReadToEnd();
            Console.WriteLine(responseString);
            // Close the stream object
            streamResponse.Close();
            streamRead.Close();

            // Release the HttpWebResponse
            response.Close();
        }