vb.net Arraylistをカンマ区切りに変換する

String.Join()と.ToArray()でできた

                    Str = String.Join(",", LineData.ToArray())

                    Dim LineData As New ArrayList
                    LineData.Clear()

                    For Each fld As Integer In m_clsProductName.SHIPPING_PRODUCT_FLD
                        LineData.Add(getFieldValue(fld, item))
                    Next
                    Str = String.Join(",", LineData.ToArray())