Netduino - Twitter WebRequest and Parsing

        private ArrayList ParseResponse(string html)
        {
            // Get the index of the first result
            int resultIndex = html.IndexOf("\"results\":[{\"created_at\":");

            // Check if there is no result (no result(s) shows "results:[]" and thus index == -1)
            if (resultIndex == -1) return null;

            // Take apart the results from the full json
            html = html.Substring(resultIndex + 11);

            // ArrayList to store individual results
            ArrayList results = new ArrayList();
            // Bool to indicate wheter there are more results left in the json
            bool moreResults = true;

            // Split the individual results
            do
            {
                resultIndex = html.IndexOf("},{\"created_at\":");
                if (resultIndex == -1)
                {
                    moreResults = false;
                    results.Add(html);
                }
                else
                {
                    results.Add(html.Substring(0, resultIndex));
                    html = html.Substring(resultIndex + 2);
                }
            } while (moreResults);



            // Save the tweets in an ArrayList
            ArrayList tweets = new ArrayList();

            // Make new tweet object of the results and put them in the ArrayList
            foreach (string result in results)
            {

                // User
                int userIndex = result.IndexOf("\"from_user\":\"") + 13;
                int userEndIndex = result.IndexOf(",\"from_user_id\":");
                string user = result.Substring(userIndex, userEndIndex - userIndex - 1);

                // Text
                int textIndex = result.IndexOf("\"text\":\"") + 8;
                int textEndIndex = result.IndexOf(",\"to_user\":");
                string text = result.Substring(textIndex, textEndIndex - textIndex - 1);

                // @todo ID

                tweets.Add(new Tweet()
                {
                    Text = text,
                    User = user
                });

            }

            // Return results
            return tweets;
        }

        /// <summary>
        /// Performs a HTTP GET WebRequest.
        /// </summary>
        /// <param name="url">The URL which needs to be requested.</param>
        /// <returns>The WebResponse of the request.</returns>
        private string PerformGetRequest(string url)
        {
            HttpWebRequest request = HttpWebRequest.Create(url) as HttpWebRequest;
            request.KeepAlive = false;
            WebResponse response = request.GetResponse();
            StreamReader reader = new StreamReader(response.GetResponseStream());
            string responseString = reader.ReadToEnd();
            reader.Close();
            return responseString;
        }