public IActionResult Delete(int id)
        {
            var surveyToDelete = _adminManager.GetSurvey(id);

            if (surveyToDelete == null)
            {
                return(NotFound());
            }

            _adminManager.DeleteSurvey <SurveyDTO>(surveyToDelete);
            _adminManager.SurveySave();

            return(NoContent());
        }