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        /// The caller is dispatching an intertask SendMessage call and cannot call out via PostMessage.

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            static extern bool PostMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

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                PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

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       Shared Function PostMessage(hWnd As IntPtr, Msg As UInteger, wParam As IntPtr, lParam As IntPtr) As<MarshalAs(UnmanagedType.Bool)> Boolean

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         PostMessage(hWnd, WM_CLOSE, IntPtr.Zero, IntPtr.Zero)

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        QS_POSTMESSAGE =    0x0008,

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        QS_ALLPOSTMESSAGE = 0x0100,

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        QS_ALLEVENTS = (QS_INPUT | QS_POSTMESSAGE | QS_TIMER | QS_PAINT | QS_HOTKEY),

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        QS_ALLINPUT = (QS_INPUT | QS_POSTMESSAGE | QS_TIMER | QS_PAINT | QS_HOTKEY | QS_SENDMESSAGE)

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Summary

The PostMessage API

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static extern bool PostMessage(HandleRef hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

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Private Shared Function PostMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Boolean

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class method PostMessage(hWnd: IntPtr; Msg: UInt32; wParam, lParam: IntPtr): Boolean; external;

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A wrapper for PostMessage looking for errors:

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    void PostMessageSafe( HandleRef hWnd, uint msg, IntPtr wParam, IntPtr lParam )

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        bool returnValue = PostMessage( hWnd, msg, wParam, lParam );

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Documentation

[PostMessage] on MSDN

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[DllImport("User32.Dll", EntryPoint = "PostMessageA")]

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public static extern bool PostMessage(IntPtr hWnd, uint msg, int wParam, int lParam);

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Declare Function PostMessageA Lib "user32.dll" (TODO) As TODO

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PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('h'), 0);

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PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('e'), 0);

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PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('l'), 0);

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PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('l'), 0);

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PostMessage(hWnd,  WM_KEYDOWN, VkKeyScan('o'), 0);

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public static extern bool PostMessageW(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

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public static extern bool PostMessageW(IntPtr hWnd, uint Msg, UIntPtr wParam, UIntPtr lParam);

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public static extern bool PostMessageW(IntPtr hWnd, int Msg, int wParam, IntPtr lParam);

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public static extern bool PostMessageW(IntPtr hWnd, uint Msg, uint wParam, ref IntPtr lParam);

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public static extern bool PostMessageW(IntPtr hWnd, uint Msg, uint wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);

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public static extern bool PostMessageW(IntPtr hWnd, uint Msg, IntPtr wParam, StringBuilder lParam);

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Documentation

[PostMessageA] on MSDN

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MSDN recommends using PostQuitMessage over PostMessage when you want to send WM_QUIT http://msdn.microsoft.com/en-us/library/ms632641%28v=vs.85%29.aspx

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    ///The caller is dispatching an intertask SendMessage call and cannot call out via PostMessage.

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    [Description("The caller is dispatching an intertask SendMessage call and cannot call out via PostMessage.")]

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    '''The caller is dispatching an intertask SendMessage call and cannot call out via PostMessage.

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    <Description("The caller is dispatching an intertask SendMessage call and cannot call out via PostMessage.")> _

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  PM_QS_POSTMESSAGE = (QueueStatusFlags.QS_POSTMESSAGE | QueueStatusFlags.QS_HOTKEY | QueueStatusFlags.QS_TIMER) << 16,

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    QS_POSTMESSAGE = 0x8,

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    QS_ALLEVENTS = (QS_INPUT | QS_POSTMESSAGE | QS_TIMER | QS_PAINT | QS_HOTKEY),

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    QS_ALLINPUT = (QS_SENDMESSAGE | QS_PAINT | QS_TIMER | QS_POSTMESSAGE | QS_MOUSEBUTTON | QS_MOUSEMOVE | QS_HOTKEY | QS_KEY),

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    QS_ALLPOSTMESSAGE = 0x100,

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    PM_QS_POSTMESSAGE = (QueueStatusFlags.QS_POSTMESSAGE Or QueueStatusFlags.QS_HOTKEY Or QueueStatusFlags.QS_TIMER) << 16

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    QS_POSTMESSAGE = &H8

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    QS_ALLEVENTS = (QS_INPUT Or QS_POSTMESSAGE Or QS_TIMER Or QS_PAINT Or QS_HOTKEY)

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    QS_ALLINPUT = (QS_SENDMESSAGE Or QS_PAINT Or QS_TIMER Or QS_POSTMESSAGE Or QS_MOUSEBUTTON Or QS_MOUSEMOVE Or QS_HOTKEY Or QS_KEY)

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    QS_ALLPOSTMESSAGE = &H100

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  QS_POSTMESSAGE = 0x0008,

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  QS_ALLPOSTMESSAGE = 0x0100,

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  QS_ALLEVENTS = QS_INPUT | QS_POSTMESSAGE | QS_TIMER | QS_PAINT | QS_HOTKEY,

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  QS_ALLINPUT = QS_INPUT | QS_POSTMESSAGE | QS_TIMER | QS_PAINT | QS_HOTKEY | QS_SENDMESSAGE

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   QS_POSTMESSAGE = &H8

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   QS_ALLEVENTS = (QS_INPUT Or QS_POSTMESSAGE Or QS_TIMER Or QS_PAINT Or QS_HOTKEY)

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   QS_ALLINPUT = (QS_SENDMESSAGE Or QS_PAINT Or QS_TIMER Or QS_POSTMESSAGE Or QS_MOUSEBUTTON Or QS_MOUSEMOVE Or QS_HOTKEY Or QS_KEY)

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   QS_ALLPOSTMESSAGE = &H100