Reboot machine from a C#/WPF app

Try this:

System.Diagnostics.Process.Start("shutdown.exe", "-r -t 0");

This starts Windows' inbuilt shutdown tool, which can also shut down or logoff a remote or the local machine.

Here is the list of full options from ss64.com:

Syntax      SHUTDOWN [logoff_option]  [/m \\Computer] [options]logoff_option:    /i         Display the GUI (must be the first option)    /l         Log off. This cannot be used with /m or /d option    /s         Shutdown    /r         Shutdown and Restart    /a         Abort a system shutdown.               (only during the time-out period)    /p         Turn off the local computer with no time-out or warning               (only with /d)    /h         Hibernate the local computer (only with /f )    /e         Document the reason for an unexpected shutdown of a computerOptions:   /m \\Computer  : A remote computer to shutdown.   /t:xxx         : Time until system shutdown in seconds.                     The valid range is xxx=0-600 seconds. [default=30]   /c "Msg"       : An optional shutdown message [Max 127 chars]   /f             : Force running applications to close.                    This will not prompt for File-Save in any open applications.                    so will result in a loss of all unsaved data!!!   /d u:xx:yy     : List a USER reason code for the shutdown.    /d P:xx:yy     : List a PLANNED reason code for the shutdown.                     xx Specifies the major reason code (0-255)                     yy Specifies the minor reason code (0-65536)

You'll probably notice that I have used the Linux/UNIX style of passing command-line arguments (using the '-') sign. On Windows, the convention is using '/'. This doesn't matter - the program doesn't care.

You can use the ExitWindowsEx API. From pinvoke.net

[Flags]public enum ExitWindows : uint{   // ONE of the following five:   LogOff = 0x00,   ShutDown = 0x01,   Reboot = 0x02,   PowerOff = 0x08,   RestartApps = 0x40,   // plus AT MOST ONE of the following two:   Force = 0x04,   ForceIfHung = 0x10,}[Flags]enum ShutdownReason : uint{    MajorApplication = 0x00040000,    MajorHardware = 0x00010000,    MajorLegacyApi = 0x00070000,    MajorOperatingSystem = 0x00020000,    MajorOther = 0x00000000,    MajorPower = 0x00060000,    MajorSoftware = 0x00030000,    MajorSystem = 0x00050000,    MinorBlueScreen = 0x0000000F,    MinorCordUnplugged = 0x0000000b,    MinorDisk = 0x00000007,    MinorEnvironment = 0x0000000c,    MinorHardwareDriver = 0x0000000d,    MinorHotfix = 0x00000011,    MinorHung = 0x00000005,    MinorInstallation = 0x00000002,    MinorMaintenance = 0x00000001,    MinorMMC = 0x00000019,    MinorNetworkConnectivity = 0x00000014,    MinorNetworkCard = 0x00000009,    MinorOther = 0x00000000,    MinorOtherDriver = 0x0000000e,    MinorPowerSupply = 0x0000000a,    MinorProcessor = 0x00000008,    MinorReconfig = 0x00000004,    MinorSecurity = 0x00000013,    MinorSecurityFix = 0x00000012,    MinorSecurityFixUninstall = 0x00000018,    MinorServicePack = 0x00000010,    MinorServicePackUninstall = 0x00000016,    MinorTermSrv = 0x00000020,    MinorUnstable = 0x00000006,    MinorUpgrade = 0x00000003,    MinorWMI = 0x00000015,    FlagUserDefined = 0x40000000,    FlagPlanned = 0x80000000}[DllImport("user32.dll", SetLastError = true)][return: MarshalAs(UnmanagedType.Bool)]static extern bool ExitWindowsEx(ExitWindows uFlags, ShutdownReason dwReason);

And to use it:

ExitWindowsEx(  ExitWindows.Reboot,  ShutdownReason.MajorOther | ShutdownReason.MinorOther | ShutdownReason.FlagPlanned); 

An alternative would be to use WMI (i.e. the System.Management namespace); Google brings up variations on this code --

  ManagementClass W32_OS = new ManagementClass("Win32_OperatingSystem")  ManagementBaseObject inParams, outParams;  int result;  W32_OS.Scope.Options.EnablePrivileges = true;  foreach(ManagementObject obj in W32_OS.GetInstances())  {    inParams = obj.GetMethodParameters("Win32Shutdown");    inParams["Flags"] = 6; //ForcedReboot; -- fixed to restart rather than shutdown    inParams["Reserved"] = 0;    outParams = obj.InvokeMethod("Win32Shutdown", inParams, null)    result = Convert.ToInt32(outParams["returnValue"]);    if (result !=0) throw new Win32Exception(result);  }