Active Directory and RDN attributes???

[rewdee]

Any help on this would be greatly appreciated!!!

I want to rename the cn attribute something like [highlight]billn[/highlight] to [highlight]williamn[/highlight]
===========================================

private void RenameMember()
 {
            DirectoryEntry objUser;

            if (String.Compare(NewUserName,User,true) != 0)
            {
                objUser = FindUser(User);
                objUser.Properties["cn"].Value = NewUserName;         
                objUser.CommitChanges();
                objUser.Close();
                objUser.Dispose();
            }
            else throw new Exception("Cannot rename user as current user =" + User +                                      " is the same as " + NewUserName);
}

public DirectoryEntry FindUser(string user)
{               
            DirectorySearcher ds = new DirectorySearcher(Base);
            ds.Filter = "(&(objectCategory=Person)(objectClass=user)(cn=" + user + "))";
            ds.SearchScope = SearchScope.Subtree;
            SearchResult results = ds.FindOne();

            if(results!=null)
            {
                DirectoryEntry de = new DirectoryEntry();
                de = results.GetDirectoryEntry();               
                return de;
            }
            else return null;
}

===========================================
When I try to update the cn attribute I'm getting The directory service cannot perform the requested operation on the RDN attribute of an object error.

Does this mean that I cannot assign this value but rather drop the Member and add a new one? Seems like I'm missing something here.

TIA,
Rewdee