C# Definition:

[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
}

VB Definition:

<Flags()> _
Enum ShutdownReason As UInteger
     MajorApplication = &H40000
     MajorHardware = &H10000
     MajorLegacyApi = &H70000
     MajorOperatingSystem = &H20000
     MajorOther = &H0
     MajorPower = &H60000
     MajorSoftware = &H30000
     MajorSystem = &H50000
Enum ShutdownReason
    MajorApplication = 0x00040000
    MajorHardware = 0x00010000
    MajorLegacyApi = 0x00070000
    MajorOperatingSystem = 0x00020000
    MajorOther = 0x00000000
    MajorPower = 0x00060000
    MajorSoftware = 0x00030000
    MajorSystem = 0x00050000

     MinorBlueScreen = &HF
     MinorCordUnplugged = &HB
     MinorDisk = &H7
     MinorEnvironment = &HC
     MinorHardwareDriver = &HD
     MinorHotfix = &H11
     MinorHung = &H5
     MinorInstallation = &H2
     MinorMaintenance = &H1
     MinorMMC = &H19
     MinorNetworkConnectivity = &H14
     MinorNetworkCard = &H9
     MinorOther = &H0
     MinorOtherDriver = &HE
     MinorPowerSupply = &HA
     MinorProcessor = &H8
     MinorReconfig = &H4
     MinorSecurity = &H13
     MinorSecurityFix = &H12
     MinorSecurityFixUninstall = &H18
     MinorServicePack = &H10
     MinorServicePackUninstall = &H16
     MinorTermSrv = &H20
     MinorUnstable = &H6
     MinorUpgrade = &H3
     MinorWMI = &H15
    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 = &H40000000
     FlagPlanned = &H80000000&
    FlagUserDefined = 0x40000000
    FlagPlanned = 0x80000000
End Enum

Notes:

Major flags should be combined with minor flags. For more info on these combinations see:

http://msdn.microsoft.com/en-us/library/aa376885(VS.85).aspx

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/sysinfo/base/system_shutdown_reason_codes.asp

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