private const UInt32 EWX_LOGOFF          = 0x00000000;

private const UInt32 EWX_SHUTDOWN        = 0x00000001;

private const UInt32 EWX_FORCE           = 0x00000004;

private const UInt32 EWX_POWEROFF        = 0x00000008;

private const UInt32 EWX_FORCEIFHUNG    = 0x00000010; // Supported on Windows 2000 and larger

    EWX_LOGOFF = 0,

    EWX_SHUTDOWN = 1,

    EWX_REBOOT = 2,

    EWX_FORCE = 4,

    EWX_POWEROFF = 8

        EWX_POWEROFF - Shuts down the system and turns off the power. ""Note:"" This flag is not supported on a Windows Mobile-based Pocket PC.

        EWX_REBOOT - Shuts down the system and reboots.

    ExitWindowsEx(ExitWindowsAction.EWX_REBOOT, 0);

Note that for an application to be restarted when the update requires a computer restart, the installer must call the ExitWindowsEx function with the EWX_RESTARTAPPS flag set or the InitiateShutdown function with the SHUTDOWN_RESTARTAPPS flag set.