void QueryTask_ExecuteRelationshipQueryCompleted(object sender, RelationshipEventArgs e) { RelationshipResult pr = e.Result; if (pr.RelatedRecordsGroup.Count == 0) { RelatedRowsDataGrid.ItemsSource = null; } else { foreach (var pair in pr.RelatedRecordsGroup) { RelatedRowsDataGrid.ItemsSource = pair.Value; } } }