Urgent Dropbox API V2 2/files/list_folder/continue

Hello Greg 

Thank you for your prompt response. I am amazed that its working now. Can you please guide me how much time it would take to fetch changeset details from dropbox because sometimes it fetches quickly and sometimes it takes our breath away by not fetching files on time.
This is my piece of code which execute after every 5 minutes to get changes from server.

  var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.dropbox.com/2/files/list_folder/continue");
                httpWebRequest.Method = "POST";
                httpWebRequest.Headers.Add("Authorization: Bearer " + GeneratedAccessToken);
                httpWebRequest.ContentType = "application/json";

                using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
                {
                    string json = new JavaScriptSerializer().Serialize(new { cursor = cursor_ });
                    streamWriter.Write(json);
                }
                string responseBody = "";
                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    var result = streamReader.ReadToEnd();
                    responseBody = result;
                }