private void Search_Click(object sender, RoutedEventArgs e)
        {
            Searching   = true;
            Results     = null;
            SearchError = null;

            OnPropertiesGroup2Changed();

            List <string> searchTerms = new List <string>();

            if (string.IsNullOrEmpty(SearchName) == false)
            {
                searchTerms.Add(@"givenName");
                searchTerms.Add(SearchName);
            }

            if (string.IsNullOrEmpty(SearchEmail) == false)
            {
                searchTerms.Add(@"givenEmail");
                searchTerms.Add(SearchEmail);
            }

            operationId = endpoint.BeginUserSearch(null, searchTerms);
        }