I've modified the below bit of code from an earlier post about rebooting a
machine. It works great except for one thing. If I display a MessageBox
before calling InvokeMethod, I get a security exception. If I don't display
the MessageBox everything works fine and the machine reboots. Any ideas on
why the MessageBox changes the security permissions? I want to display the
MessageBox asking the user if they are sure they want to restart.

Thanks.

-Mikel
ConnectionOptions co = new ConnectionOptions();

System.Management.ManagementScope ms = new
System.Management.ManagementScope("\\root\\cimv2", co);

//Query remote computer across the connection

System.Management.ObjectQuery oq = new System.Management.ObjectQuery("SELECT
* FROM Win32_OperatingSystem");

//elevate the privilages so the program can perform the reboot

ms.Options.EnablePrivileges = true;

ManagementObjectSearcher query1 = new ManagementObjectSearcher(ms,oq);

ManagementObjectCollection queryCollection1 = query1.Get();

foreach( ManagementObject mo in queryCollection1 )

{

string[] ss={"2","0"};

mo.InvokeMethod("Win32Shutdown",ss);

The native (COM) method "Win32Shutdown" is running on the process unmanaged MTA thread (like all other native WMI COM methods),
however, as your code is run on a UI (STA) thread, the  SE_SHUTDOWN privilege set on the UI thread and not propagated to the MTA
thread (which is normal), which results in a security exception when the Win32Shutdown call is made.
To solve this problem, you must make sure to run your "reboot" code on a MTA thread, f.i using an asynch. delegate.

// Show dialog box
 ......
// If OK to reboot ....
public delegate void RebootProc();

// Call reboot from an MTA worker thread
  RebootProc pfn = new RebootProc(Reboot);
  IAsyncResult ar = pfn.BeginInvoke( null, null);
  ar.AsyncWaitHandle.WaitOne(10000, false);
 }

 static void  Reboot( )
  {
    // Your reboot code here....
    // It is critical to call EnablePrivileges on this thread (MTA)
    ....
    ms.Options.EnablePrivileges = true;
    ...

  }

Willy.