about wmi

 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);
    }
   }
  }
==================
 private static void test()
 {
  ManagementObjectSearcher searcher = new ManagementObjectSearcher
   ("SELECT * FROM Win32_UserAccount");
  foreach (ManagementObject service in searcher.Get())
   Console.WriteLine("Service = " + service["Caption"]);
  Console.ReadLine();  
 }
====================
 private static void getProperty()
 {
  ManagementObject disk = new ManagementObject("Win32_LogicalDisk.DeviceID='d:'");
  PropertyDataCollection.PropertyDataEnumerator propertyEnumerator = disk.Properties.GetEnumerator();
  while(propertyEnumerator.MoveNext())
  {
   PropertyData p = (PropertyData)propertyEnumerator.Current;
   Console.WriteLine("Property found: " + p.Name+"/t"+p.Value);
  }
  Console.ReadLine();  
 }
相关的url:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/win32_autochksetting.asp。