You may look at using a repeater with 2 rows in the itemtemplate. Something
like this:

<asp:repeater>
<headertemplate>
<table>
</headertemplate>
<itemtemplate>
<tr runat="server" id="trNormal">
<td>Databind expression for column 1</td>
<td>Databind expression for column 2</td>
<td>Databind expression for column 3</td>
</tr>
<tr runat="server" id="trComment">
<td columnspan=3>Databind expression for comment</td>
</tr>
</itemtemplate>
</asp:repeater>
<footertemplate>
</table>
</footertemplate>

and handle ItemDataBound event to hide trNormal or trComment as needed.

Hello Ken,

U need to handle RowDataBound event making changes to your rows there

see sample there http://dotnetjunkies.com/WebLog/joshuagough/archive/2006/06/23/141038.aspx

---
WBR,
Michael  Nemtsev [.NET/C# MVP] :: blog: http://spaces.live.com/laflour 

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

KB> How can I make a datagrid column into a single row that spans all
KB> the
KB> other columns?
KB> In this case I have a comment field that I want to make as wide as
KB> the
KB> table but I cannot figure out how to tell asp.net datagrid that I
KB> want
KB> a new row.
KB> I am using visual studio 2005,
KB>
KB> Thanks to anybody who has tried this and has a solution
KB>
KB> KB
KB>