splitting string in textbox by new line

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VB

hello friendsa , i am creating a search page in vb.net.
here user will enter bill no in multile textbox (line by line ,one bill in one line)
this is my code .it ias working fine for comma seprated values.
but i want to use all values line by line .
how can i do it.
Thanks in Advance friends

Protected Sub btnSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearch.Click
        Dim strArr() As String
        Dim itemcount As Integer
        Dim count As Integer
        Dim str As String = txtBillNo.Text
        Dim forlabel As String
        strArr = str.Split(',')
        For itemcount = 0 To strArr.Length - 1
            superTypeObj.PSearchText = strArr(itemcount)
            dsdata = superTypeObj.SearchCourierByBillno
            Dim row As DataRow = dsdata.Tables(0).Rows(0)
            count = dsSearch.Tables(0).Rows.Count
            If count <> 0 Then
                row = dsdata.Tables(0).Rows(0)
              dsSearch.Tables(0).Rows.Add(dsdata.Tables(0).Rows(0).ItemArray)
            Else
                forlabel += strArr(itemcount) & ", " & ""
            End If


        Next

        'superTypeObj.PSearchText = txtBillNo.Text

        ' dsSearch = superTypeObj.SearchCourierByBillno

        count = dsSearch.Tables(0).Rows.Count

        If count > 0 Then
            If count <= 15 Then
                Dg.PagerStyle.Visible = False
            End If
            Dg.DataSource = dsSearch
            Dg.DataBind()
            lblMsg.Text = "following" & forlabel & " Waybillnos are not correct "
        Else
            Dg.Visible = "False"

            lblMsg.Text = "following" & forlabel & " Waybillnos are not correct "
        End If
    End Sub