ASP.net VB.net Table border lines appearing when none set

Hi
The code below dynamically adds the following table to my ASP.net web age.
I have deliberately tried to add no border lines but there are lines appearing
What is causing this? How do I stop it?


    Function oTableReport() As Table
        Try

            Dim rowCnt As Integer
            ' Current row count
            Dim rowCtr As Integer
            ' Total number of cells (columns).
            Dim cellCtr As Integer
            ' Current cell counter.
            Dim cellCnt As Integer
            Dim Table1 As New Table
            rowCnt = 2
            cellCnt = 3

            Table1.GridLines = GridLines.None

            For rowCtr = 1 To rowCnt
                Dim tRow As New TableRow()
                tRow.BackColor = Drawing.Color.Aqua
 
                For cellCtr = 1 To cellCnt
                    Dim tCell As New TableCell()
                    tCell.Text = "Row " & rowCtr & ", Cell " & cellCtr
                    tCell.BackColor = Drawing.Color.Aqua
                    'tCell.ForeColor = Drawing.Color.Blue
                    ' Add new TableCell object to row.
                    tRow.Cells.Add(tCell)
                Next
                ' Add new row to table.
                Table1.Rows.Add(tRow)
            Next
            Return Table1
        Catch ex As Exception
            MsgBox(ex.Message & " rew33")
        End Try
    End Function