怎样取得NT下组中用户列表

请问我怎样取得NT下组中用户列表，能否给一个实例。
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play with:

using System;
using System.DirectoryServices;

class Class1
{
static void Main (string[] args)
{
ShowLocalUsers();
}

public static void ShowLocalUsers()
{
DirectoryEntry root = new DirectoryEntry("WinNT:"); //alternativ WinNT://your_domain
DirectoryEntries domains = root.Children;
domains.SchemaFilter.Add("domain");
foreach (DirectoryEntry domain in domains)
{
Console.WriteLine(domain.Name);
DirectoryEntries computers = domain.Children;
computers.SchemaFilter.Add("computer");
foreach (DirectoryEntry computer in computers)
{
Console.WriteLine("\t" + computer.Name);
DirectoryEntries users = computer.Children;
users.SchemaFilter.Add("user");
foreach (DirectoryEntry user in users)
{
Console.WriteLine("\t\t" + user.Name);
}
}
}
}
}