Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.
so if you hit the error above, you have used MsgBox or MessageBox dialogue boxes to confirm the user click.
well the solution is simple use Ajax ConfirmButton
see the link below for syntax:
http://www.asp.net/AJAX/AjaxControlToolkit/Samples/ConfirmButton/ConfirmButton.aspx
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