Confirm user is logged in?

Hi all,

I want to confirm that a user is the logged in user before submission of sensitive data.

So, the user has already logged in (using membership/ roles) and when they click a button I want them to be prompted with a "confirm your password" dialog - in case a user has left the browser open without logging out or in case the Authentication timeout has occured.

I can code it myself but I wondered if there was already an in-built solution for this issue.  I looked at the stored procedures for Membership but couldn't see one that handled this situation.

Thanks.