How to allow FileUpload to access a private folder in ASP.NET?

Question

Hello everyone

I have a FileUpload control in my ASP.NET application, and I want to save the users files in a private folder. When I say "private folder", I mean that in my web.config I have the following for every directory in the application:

<authentication mode="Forms">
   <forms loginUrl="Logon.aspx" name=".ASPXFORMSAUTH">
   </forms>
</authentication>
<authorization>
   <allow users="?"/>
</authorization>

and I have this for the "private directory":

<location path="UsersCV">
    <system.web>
        <authorization>
        <deny users="*"/>
     </authorization>
    </system.web>
 </location>

So, I want this folder to be not accesible for anyone, except for my app. When I try to upload a file with the FileUpload control, I get System.UnauthorizedAccessException. We have IIS6 and Windows server 2003.

QUESTION: How can my app access to that private folder?

Thank you very much in advance