I suggest you use Table object instead of the HTML table. It will solve your problem.

<asp:Table ID="YourTable" runat="server" CellPadding="0" CellSpacing="0">
</asp:Table>

 And then you can add from your code rows and elements dynamically.

Dim FirstRow As New TableRow
Dim FirstCell As New TableCell
Dim YourTextBox As New TextBox
FirstCell.Controls.Add(YourTextBox)
FirstRow.Cells.Add(FirstCell)
YourTable.Rows.Add(FirstRow)