[PreserveSig] int HandleMenuMsg2( uint uMsg, uint wParam, uint lParam, IntPtr plResult );

Make sure your object explicitly lists all the IContextMenu interfaces or the shell may never call IContextMenu3.HandleMenuMsg2. For example:

    int HandleMenuMsg(uint uMsg, IntPtr wParam, IntPtr lParam);

        [PreserveSig] int HandleMenuMsg2( uint uMsg, uint wParam, uint lParam, IntPtr plResult );

    Public Overridable Sub UIActivateIO(fActivate As Int32, ByRef Msg As MSG) Implements IInputObject.UIActivateIO

    ''' <param name="msg"></param>

    Public Overridable Function TranslateAcceleratorIO(ByRef msg As MSG) As Int32 Implements IInputObject.TranslateAcceleratorIO

    If msg.message = &H100 Then

        If msg.wParam = CUInt(Keys.Tab) OrElse msg.wParam = CUInt(Keys.F6) Then

    Sub UIActivateIO(fActivate As Int32, ByRef msg As MSG)

    Function TranslateAcceleratorIO(ByRef msg As MSG) As Int32

Public Structure MSG

    Public Overridable Sub UIActivateIO(fActivate As Int32, ByRef Msg As MSG) Implements IInputObject.UIActivateIO

    ''' <param name="msg"></param>

    Public Overridable Function TranslateAcceleratorIO(ByRef msg As MSG) As Int32 Implements IInputObject.TranslateAcceleratorIO

    If msg.message = &H100 Then

        If msg.wParam = CUInt(Keys.Tab) OrElse msg.wParam = CUInt(Keys.F6) Then

    Sub UIActivateIO(fActivate As Int32, ByRef msg As MSG)

    Function TranslateAcceleratorIO(ByRef msg As MSG) As Int32

Public Structure MSG

     void DoVerb(uint iVerb, uint lpmsg, object pActiveSite, uint lindex, uint hwndParent, uint lprcPosRect);

        /// <param name="pwzCancelMsg">A pointer to a null-terminated Unicode string that contains the message to be displayed.</param>

        void SetCancelMsg(

            [MarshalAs(UnmanagedType.LPWStr)] string pwzCancelMsg, //LPCWSTR

pd.SetCancelMsg("Please wait while the operation is cancelled", null);

    int TranslateAccelerator(ref MSG pMsg);

MSG

    int TranslateAccelerator(ref MSG pMsg);

MSG

    void TranslateAcceleratorSB(IntPtr pmsg, UInt16 wID);

    void SendControlMsg(UInt32 id, UInt32 uMsg, UInt32 wParam, UInt32 lParam, IntPtr pret);

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    Public Enum ABMsg

    Private Shared Function RegisterWindowMessage(ByVal msg As String) As Integer

    Dim ret As Long = SHAppBarMessage(CType(ABMsg.ABM_NEW, Integer), abd)

    SHAppBarMessage(ABMsg.ABM_REMOVE, abd)

    SHAppBarMessage(CType(ABMsg.ABM_QUERYPOS, Integer), abd)

    SHAppBarMessage(CType(ABMsg.ABM_SETPOS, Integer), abd)

    lRet = SHAppBarMessage(ABMsg.ABM_SETAUTOHIDEBAR, abd)

    Dim msg As New StringBuilder

        state = SHAppBarMessage(CType(ABMsg.ABM_GETSTATE, Integer), ABD)

        hWndAppBar = SHAppBarMessage(CType(ABMsg.ABM_GETAUTOHIDEBAR, Integer), ABD)

        tsize = SHAppBarMessage(CType(ABMsg.ABM_GETTASKBARPOS, Integer), ABD)

        public static extern IntPtr SendMessage(HandleRef hWnd, uint Msg, int wParam, IntPtr lParam);

        public static extern IntPtr SendMessage(HandleRef hWnd, int msg, int wParam, string lParam);

        public delegate int BrowseCallBackProc(IntPtr hwnd, int msg, IntPtr lp, IntPtr wp);

        public int OnBrowseEvent(IntPtr hWnd, int msg, IntPtr lp, IntPtr lpData)

            switch(msg)

            uint wMsg,

            uint wMsg,

    MsgBox(fileP.ToString)

   public MessageType Type { get; set; }           // MessageType.FV_RUBBERBAND_GEORECT_MSG (3)

   switch (m.Msg)

       var msg = Marshal.PtrToStructure<COPYDATASTRUCT>(m.LParam);

       var pData = Marshal.PtrToStructure<GEORECT>(msg.lpData);

       if (MessageType.FV_RUBBERBAND_GEORECT_MSG == pData.Type

    public uint dwMsgAndCertEncodingType;

    public uint dwMsgEncodingType;

    public UInt32 dwMsgEncodingType;

    public UInt32 cMsgCert;

    public IntPtr rgpMsgCert;

    public UInt32 cMsgCrl;

    public IntPtr rgpMsgCrl;

      public uint dwMsgEncodingType;

        Public dwMsgEncodingType As UInt32

2. The only supported dwMsgEncodingType is X509_ASN_ENCODING | PKCS_7_ASN_ENCODING (see constants section)

struct EVENTMSG

Structure EVENTMSG

        internal int uMsg;

  Public uMsg As Integer

public struct MSGBOXPARAMS

    public MsgBoxCallback lpfnMsgBoxCallback;

public delegate void MsgBoxCallback( HELPINFO lpHelpInfo );

        Public Shared Function FromMessage(ByVal msg As Message) As NMCUSTOMDRAW

            Return DirectCast(msg.GetLParam(GetType(NMCUSTOMDRAW)), NMCUSTOMDRAW)

   Public Shared Function FromMessage(ByVal msg As Message) As NMHDR

     Return DirectCast(msg.GetLParam(GetType(NMHDR)), NMHDR)

    Private Delegate Function TranslateDispatchCallbackDelegate(ByRef lpmsg As MSG) As Boolean

    Private Function TranslateDispatchCallback(ByRef lpmsg As MSG) As Boolean

            public string lpRebootMsg;

   Public lpRebootMsg As String

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    uint TranslateAccelerator(ref MSG pmsg);

    /// <summary> Control processes the message in the MSG structure that lParam points to. </summary>

    MSGFLTINFO_NONE = 0,

    MSGFLTINFO_ALREADYALLOWED_FORWND,

    MSGFLTINFO_ALREADYDISALLOWED_FORWND,

    MSGFLTINFO_ALLOWED_HIGHER

     WH_SYSMSGFILTER = 6,

     WH_SYSMSGFILTER = 6

    public const int CRYPT_E_MSG_ERROR = unchecked((int)0x80091001);

    public const int CRYPT_E_INVALID_MSG_TYPE = unchecked((int)0x80091004);

    public const int CRYPT_E_STREAM_MSG_NOT_READY = unchecked((int)0x80091010);

    public const int CRYPT_E_UNEXPECTED_MSG_TYPE = unchecked((int)0x8009200A);

    public const int CRYPT_E_BAD_MSG = unchecked((int)0x8009200D);

    Public Const CRYPT_E_MSG_ERROR As Integer = CInt(&H80091001UI)

    Public Const CRYPT_E_INVALID_MSG_TYPE As Integer = CInt(&H80091004UI)

    Public Const CRYPT_E_STREAM_MSG_NOT_READY As Integer = CInt(&H80091010UI)

    Public Const CRYPT_E_UNEXPECTED_MSG_TYPE As Integer = CInt(&H8009200aUI)

    Public Const CRYPT_E_BAD_MSG As Integer = CInt(&H8009200dUI)

    MSGFLT_RESET = 0,

    MSGFLT_ALLOW,

    MSGFLT_DISALLOW

        WARNING_MSG_ALIAS_NOT_ADDED,

     DWLP_MSGRESULT = 0x0,

     DWLP_MSGRESULT = &H0

     DWLP_MSGRESULT As Long = &H0

    /// The WM_CTLCOLORMSGBOX message is sent to the owner window of a message box before Windows draws the message box. By responding to this message, the owner window can set the text and background colors of the message box by using the given display device context handle.

    CTLCOLORMSGBOX = 0x0132,

    '''The WM_CTLCOLORMSGBOX message is sent to the owner window of a message box before Windows draws the message box. By responding to this message the owner window can set the text and background colors of the message box by using the given display device context handle.

    WM_CTLCOLORMSGBOX = &H132

            if(m.Msg == WM_SYSCOMMAND)

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        catch(Exception msg)

        //Console.WriteLine(msg.Message);

static extern bool DwmDefWindowProc(IntPtr hWnd, int msg, IntPtr wParam, IntPtr lParam, ref IntPtr plResult);

Private Shared Function DwmDefWindowProc(ByVal hWnd As IntPtr, ByVal msg As Integer, ByVal wParam As IntPtr, ByVal lParam As IntPtr, ByRef plResult As IntPtr) As Integer

        MapiMessage msg = new MapiMessage();

        msg.subject = "Hello World!";

        msg.noteText = "See attached file for details";

        msg.files = GetAttachments(fileName, out msg.fileCount);

        int result = MAPISendMail(new IntPtr(0), new IntPtr(0), msg, 0x00000001 | 0x00000008, 0);

    public static extern IntPtr CertCreateCTLContext(uint dwMsgAndCertEncodingType, IntPtr pbCtlEncoded, uint cbCtlEncoded);

These constants are used for the dwMsgAndCertEncodingType.

    public struct CMSG_SIGNED_ENCODE_INFO

        public static extern bool CryptMsgClose(

            IntPtr hCryptMsg

        public static extern bool CryptMsgGetParam(

            IntPtr hCryptMsg,

        public static extern bool CryptMsgGetParam(

            IntPtr hCryptMsg,

        public static extern bool CryptMsgGetParam(

            IntPtr hCryptMsg,

        public static extern IntPtr CryptMsgOpenToDecode(

            uint dwMsgEncodingType,

            uint dwMsgType,

static extern IntPtr CryptMsgOpenToEncode(int dwMsgEncodingType, uint dwFlags, int dwMsgType, IntPtr pvMsgEncodeInfo, IntPtr pszInnerContentObjID, IntPtr pStreamInfo);

Declare Function CryptMsgOpenToEncode Lib "crypt32.dll" (TODO) As TODO

        public static extern bool CryptMsgUpdate(

            IntPtr hCryptMsg,

        IntPtr pdwMsgAndCertEncodingType,

        IntPtr phMsg,

    verifyParams.dwMsgAndCertEncodingType = CryptoConstants.X509_ASN_ENCODING | CryptoConstants.PKCS_7_ASN_ENCODING;

     cpMessageParams.dwMsgEncodingType = X509_ASN_ENCODING | PKCS_7_ASN_ENCODING;

        public uint dwMsgAndCertEncodingType;

        public IntPtr hCryptMsg;

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MsgBox “Could not attach to PnP node”

MsgBox “Could not get the name of this device”

MsgBox “Device not connected”

    MsgBox(ClassGuid.ToString)

        public IntPtr InstallMsgHandler;

        public IntPtr InstallMsgHandlerContext;

        Public InstallMsgHandler As IntPtr

        Public InstallMsgHandlerContext As IntPtr

                string msg  = GetError(IntPtr.Zero) + "\nconnection string:\n\t" + connstr;

                throw new Exception(msg);

        StringBuilder msg   = new StringBuilder(256);

            msg,

            (short) msg.Capacity,

            string err = msg.ToString();

   StringBuilder errorMsg, short errorMsgMax, out short errorMsgLength);

    ByVal errorMsg As Text.StringBuilder, ByVal errorMsgMax As Short, ByRef errorMsgLength As Short) As Short