private static void ValidateParams(string surveyId, InterviewPackageType interviewPackageType)
{
if (surveyId == null)
throw new ArgumentNullException("surveyId");
if (surveyId.Trim().Length == 0)
throw new ArgumentException("surveyId cannot be empty");
if (interviewPackageType == InterviewPackageType.Unknown)
throw new ArgumentException("package type cannot be Unknown");
}