For questions not directly related to my book, please pick an appropriate forum from this list: http://p2p.wrox.com/asp-net-4-539/
instead. This makes it easier for everyone to find what they are looking for.
That said, here's what I would do:
1. Bind the data to a ListView
2. Set the CommandArgument of the delete button to the ID of the comment
3. Handle the appropriate event
4. Look at the CommandArgument and use that to edit the comment.