sql Server IIS insert or modify problems

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I created a web site which inserts data into an access database and shows updated results.

I use an sqldatasource that connects to the access file.

All works fine when using the localhost webserver.

But in real world when using the IIS, select query works but modify and insert does not work.
I added permissions (full control) in the directory containing database to aspnet, IUsr, network service, but still not works.

Thank you