check if user is the one specified in <location path="...

In an intranet asp.net application I have the following in the web config:

<authentication mode="Windows" />

<location path="AdministrationFolder">
<system.web>
<authorization>
<allow users="John"/>
<allow users="David"/>
<allow users="Eric"/>
<deny users="*"/>
</authorization>
</system.web>
</location>

The "Default.aspx" page is accessible to everybody.
I have a link <a href=Administration.aspx>Administration</a> on this page,
which I need it to be visible only if the user is one of those specified in
"<location path=....>" (If user = in (John, David, Eric) then, display the
link.)



How can I check if the logged user is one of the mentioned users above ?


.

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