public ActionResult EmailSurvey([FromBody] EmailSurveyRequest req)
        {

           ISurvey emailSurvey = SurveyFactory.Build(SurveyTypes.EmailSurvey);
           var survey = _context.Survey.Find(req.SurveyId);
           emailSurvey.LoadSurvey(survey);
           emailSurvey.execute();
           return Ok();
        }