private CalendarService CalendarServiceByToken(AccessTokenService accessTokenService)
        {
            var tokenObject   = JObject.Parse(_accessTokenService.GetValue());
            var tokenResponse = new TokenResponse();

            tokenResponse.AccessToken = tokenObject.GetValue("AccessToken").Value <string>();

            var service = new CalendarService();

            service.HttpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer",
                                                                                                   tokenResponse.AccessToken);
            return(service);
        }