/// <summary>
        /// Lấy Token đăng nhập
        /// </summary>
        /// <param name="username"></param>
        /// <param name="password"></param>
        /// <returns></returns>
        private static ApiKey GetToken(string username, string password)
        {
            using (var client = new HttpClient())
            {
                client.BaseAddress = new Uri(Setting.DataBaseSetting.WebService917Location);
                client.DefaultRequestHeaders.Accept.Clear();
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                client.MaxResponseContentBufferSize = 2000005000;
                // HTTP POST
                //ApiToken input = new ApiToken { username = username, password = password };
                var values = new Dictionary<string, string>
                {
                   { "username", username},
                   { "password", Utilities.StringUtilities.CreateMD5(password) }
                };
                var content = new FormUrlEncodedContent(values);
                //var data = string.Format("username={0}&password={1}", username, password);
                HttpResponseMessage response = client.PostAsync("api/token/take", content).Result;
                if (response.IsSuccessStatusCode)
                {
                    string result = response.Content.ReadAsStringAsync().Result;
                    //string ss = response.Content.ReadAsAsync().Result;
                    KQPhienLamViec plv = (KQPhienLamViec)JsonConvert.DeserializeObject<KQPhienLamViec>(result);
                    //= response.Content.ReadAsAsync<KQPhienLamViec>().Result;
                    if (plv.maKetQua == "200")
                    {
                        return plv.APIKey;
                    }
                }
                return null;
            }
        }