wpf listcollectionview grouping by multiple columns. Only view

private void GroupingByMultipleColumns(ObservableCollection<DummyModel> p_list)
{
    var _listcollectionview = new ListCollectionView(p_list);
    _listcollectionview.GroupDescriptions.Add(new PropertyGroupDescription("Name"));
    _listcollectionview.GroupDescriptions.Add(new PropertyGroupDescription("Age"));
    Datagrid1.ItemsSource = _listcollectionview;
}