Adding a book mark to the end of a PostBack when Selected Index changed

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I have a DataGrid that shows a part of an article.

When I click a Button column where the command is "Selected", I have the
rest of the article show up at the bottom of the page in a label.

What I would like to do is append the "#bottom" to the end of the URL when
the Selected Index changes.

This way the page will be positioned at the bottom.

Is there a way I can do this without a redirection?

Thanks in advance!
Aaron