ArcGISWindowsPhoneSDK.PortalSearch.DoSearch C# (CSharp) Method

        private void DoSearch()
        {
            ResultsListBox.ItemsSource = null;
            ResetVisibility();
            if (QueryText == null || string.IsNullOrEmpty(QueryText.Text.Trim())) return;
            if (string.IsNullOrEmpty(portal.Url))
                portal.Url = DEFAULT_SERVER_URL;
            var queryString = string.Format("{0} type:\"web map\" NOT \"web mapping application\"", QueryText.Text.Trim());
            if (portal.CurrentUser != null && portal.ArcGISPortalInfo != null && !string.IsNullOrEmpty(portal.ArcGISPortalInfo.Id))
                queryString = string.Format("{0} and orgid: \"{1}\"", queryString, portal.ArcGISPortalInfo.Id);
            var searchParameters = new SearchParameters()
            {
                QueryString = queryString,
                SortField = "avgrating",
                SortOrder = QuerySortOrder.Descending,
                Limit = 20
            };
            portal.SearchItemsAsync(searchParameters, (result, error) =>
            {
                ResultsListBox.ItemsSource = result.Results;
            });
        }