If you want your table column to not wrap in ASP.Net, you can use the NoWrap property in the tag like so:

<td nowrap="nowrap">
 content
</td>

This makes the code xhtml compliant and prevents warnings in the source view of designer in Visual Studio. Normally you could just specify a nowrap attribute by itself in plain html.

Or the CSS equivalent of setting nowrap:

<td style="white-space:nowrap;">
 content
</td>

Again, using the first option will prevent warnings in source view.