主题：判断分组行

 For Each pd As String In pds '分产品打印
    For Each dr As DataRow In drs '逐行打印此产品的订单
        cnt = rt.Rows.Count
            For c As Integer = 0 To tbl.Cols.Count - 1
                rt.Cells(cnt, c).Text = dr(tbl.Cols(c).Name)
            Next
    Next
    cnt = rt.Rows.Count
Next

老师这种语句怎么判断当前是不是分组行?