请问怎样获得指定域名的域中所有的计算机名？急急急！！！

Question

using  System;  
using  System.DirectoryServices;  
using  System.Net;  
 
class  TestClass  
{  
           static  void  Main  (string[]  args)  
           {  
                       ShowComputers();  
           }  
           public  static  void  ShowComputers()  
           {  
                               //or  use  "WinNT://your_domain_name"  
                       DirectoryEntry  root  =  new  DirectoryEntry("WinNT:");                                            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);  
                                               IPHostEntry  iphe  =  Dns.GetHostByName(computer.Name);  
                                               foreach  (IPAddress  ip  in  iphe.AddressList)  
                                               {  
                                                           Console.WriteLine("\t\t"  +  ip);  
                                               }  
                                               DirectoryEntries  users  =  computer.Children;  
                                   }  
                       }  
           }  
 
}