[WiX-users] Dialog data validation and error messages

[Kevin D. <kev...@gm...>]

I'm creating a fairly standard UI for specifying the username and
password to run a service as during a ServiceInstall action. I'm doing
the usual checks - non-blank user name, password and confirm password
boxes match, that sort of the thing. What I'm uncertain about is how
best to notify the user when there's a problem. Is there a best
practice about reporting data validation errors? Do I use a text
message on the dialog itself, or pop up a separate error message box?
If the latter, is there an easy way to popup a message box, or do I
need to actually define another dialog for it?

Thanks,
Kevin