Problem writing country poperty in Active Directory

[Dam]

Hi,

I'm developing an ASP .NET application that writes in user object properties
of Active Directory.
I specifed writting rights for users or groups in the domain by using the AD
console.

The problem is I can't find country property in the user object. Which
object should I use? I'm looking for c, co and countryCode properties...
When I use the Friendly-Country object and set the writting right on, a
System.UnauthorizedAccessException is thrown!

My current solution is to set writting rights on public-information,
general-information and personal-information property sets!
For security strategy reason, I don't want users or groups to write all
properties defined in those property sets.

Thanks.

Dam