wpf listcollectionview grouping by multiple columns

public class GroupData
{
    public string Column1 { get; set; }
    public string Column2 { get; set; }
}

List<GroupData> data = new List<GroupData> ();

ListCollectionView view = new ListCollectionView (data);
view.GroupDescriptions.Add (new PropertyGroupDescription ("Column1"));
view.GroupDescriptions.Add (new PropertyGroupDescription ("Column2"));