how to load config file dynamically

Question

Hi buddies.,
I need your help.
i want To create a c# class which works together with a config file placed in the /config/ folder (ie. /config/newfolder/DateFolder.config.)
i want to create a config file in this format dynamically..
how to dynamically create elements in config file.(Example here is: DateFolders,DateFolder,2009,September,5)


<DateFolders>
    <DateFolder>
        <2009>
            <september>
                <5>Page</5>
            </september>
        </2009>
    </DateFolder>

</DateFolders>