private string SurveyResponseCodeUrl(string surveyId, int? code)
{
var result = new StringBuilder(ConnectionClient.NfieldServerUri.AbsoluteUri);
result.AppendFormat(CultureInfo.InvariantCulture, @"Surveys/{0}/ResponseCodes/{1}", surveyId,
code.HasValue ? code.Value.ToString(CultureInfo.InvariantCulture) : "");
return result.ToString();
}