ServiceController[] scDevices;
  scDevices = ServiceController.GetDevices();

  int numAdapter = 0,
      numFileSystem = 0, 
      numKernel = 0, 
      numRecognizer = 0;

  // Display the list of device driver services.
  Console.WriteLine("Device driver services on the local computer:");

  foreach (ServiceController scTemp in scDevices)
  {
     // Display the status and the service name, for example,
     //   [Running] PCI Bus Driver
     //             Type = KernelDriver

     Console.WriteLine(" [{0}] {1}", 
                       scTemp.Status, scTemp.DisplayName);
     Console.WriteLine("           Type = {0}", scTemp.ServiceType); 

     // Update counters using the service type bit flags.
     if ((scTemp.ServiceType & ServiceType.Adapter) != 0)
     {
        numAdapter++;
     } 
     if ((scTemp.ServiceType & ServiceType.FileSystemDriver) != 0)
     {
        numFileSystem++;
     }  
     if ((scTemp.ServiceType & ServiceType.KernelDriver) != 0)
     {
        numKernel++;
     } 
     if ((scTemp.ServiceType & ServiceType.RecognizerDriver) != 0)
     {
        numRecognizer++;
     }
  }

  Console.WriteLine();
  Console.WriteLine("Total of {0} device driver services", scDevices.Length);
  Console.WriteLine("  {0} are adapter drivers", numAdapter);
  Console.WriteLine("  {0} are file system drivers", numFileSystem);
  Console.WriteLine("  {0} are kernel drivers", numKernel);
  Console.WriteLine("  {0} are file system recognizer drivers", numRecognizer);