/**
         * 새로운 대화방을 만듬
         */
        public bool CreateRoom(string teamId, string title, out WebexTeamsRoom room, out Int32 errorCode, out string errorMessage)
        {
            bool           status  = true;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(ROOM_ENDPOINT);

            request.Headers.Add("Authorization", string.Format("Bearer {0}", WebexTeamsClient.accessToken));
            request.ContentType = "application/json;charset=utf-8";
            request.Method      = "POST";

            try
            {
                WebexTeamsRoom input = new WebexTeamsRoom();
                input.Title = title;
                if (!string.IsNullOrEmpty(teamId))
                {
                    input.TeamId = teamId;
                }
                string payload     = JsonConvert.SerializeObject(input);
                Stream inputStream = request.GetRequestStream();
                byte[] buff        = System.Text.Encoding.UTF8.GetBytes(payload);
                inputStream.Write(buff, 0, buff.Length);
                inputStream.Close();

                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                if (response.StatusCode == HttpStatusCode.OK)
                {
                    Stream         stream = response.GetResponseStream();
                    StreamReader   reader = new StreamReader(stream, Encoding.UTF8);
                    WebexTeamsRoom result = JsonConvert.DeserializeObject <WebexTeamsRoom>(reader.ReadToEnd());

                    errorCode    = (int)HttpStatusCode.OK;
                    errorMessage = "OK";
                    room         = result;
                }
                else
                {
                    Stream       stream = response.GetResponseStream();
                    StreamReader reader = new StreamReader(stream, Encoding.UTF8);
                    JObject      resp   = JObject.Parse(reader.ReadToEnd());
                    errorCode    = (int)response.StatusCode;
                    errorMessage = resp["message"].ToString();
                    room         = null;
                    status       = false;
                }
            }
            catch (System.Exception e)
            {
                System.Console.WriteLine("Error Message : " + e.Message);
                errorCode    = -1;
                errorMessage = e.Message;
                room         = null;
                status       = false;
            }
            return(status);
        }
        /**
         * 전체 Room List를 요청 함
         */
        public bool ListRooms(out List <WebexTeamsRoom> roomList, out Int32 errorCode, out string errorMessage)
        {
            bool           status  = true;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(ROOM_ENDPOINT);

            //request.Headers.Clear();
            request.Headers.Add("Authorization", string.Format("Bearer {0}", WebexTeamsClient.accessToken));
            request.ContentType = "application/json;charset=utf-8";
            request.Method      = "GET";

            List <WebexTeamsRoom> rooms = new List <WebexTeamsRoom>();

            try
            {
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                if (response.StatusCode == HttpStatusCode.OK)
                {
                    Stream         stream        = response.GetResponseStream();
                    StreamReader   reader        = new StreamReader(stream, Encoding.UTF8);
                    JObject        roomsResponse = JObject.Parse(reader.ReadToEnd());
                    IList <JToken> items         = roomsResponse["items"].Children().ToList();
                    foreach (JToken item in items)
                    {
                        // JToken.ToObject is a helper method that uses JsonSerializer internally
                        WebexTeamsRoom room = item.ToObject <WebexTeamsRoom>();
                        rooms.Add(room);
                    }
                    errorCode    = (int)HttpStatusCode.OK;
                    errorMessage = "OK";
                    roomList     = rooms;
                }
                else
                {
                    Stream       stream = response.GetResponseStream();
                    StreamReader reader = new StreamReader(stream, Encoding.UTF8);
                    JObject      resp   = JObject.Parse(reader.ReadToEnd());
                    errorCode    = (int)response.StatusCode;
                    errorMessage = resp["message"].ToString();
                    roomList     = null;
                    status       = false;
                }
            }
            catch (System.Exception e)
            {
                System.Console.WriteLine("Error Message : " + e.Message);
                errorCode    = -1;
                errorMessage = e.Message;
                roomList     = null;
                status       = false;
            }
            return(status);
        }