I don't absolutely need to do it this way, but am curious about why it isn't working.

    sb.Append("<td style='width: 40px; text-align: center;'>");
    sb.Append("<asp:TextBox id='nbrDays' runat='server' />");
    sb.Append("</td>");

It produces the expected html output:

    <td style='width: 40px; text-align: center;'><asp:TextBox id='nbrDays' runat='server' /></td>

But it does not display on the page.  If anyone has an idea why it doesn't render on the page, I'd appreciate hearing it.

(And any suggestions on how to get a TextBox in there would also be nice.)

- Tinker