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Summary

The FlashWindowEx API

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static extern bool FlashWindowEx(ref FLASHWINFO pwfi);

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public static bool FlashWindowEx(IntPtr hWnd)

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    return FlashWindowEx(ref fInfo);

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public static bool FlashWindowEx(Form frm)

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        return FlashWindowEx(ref fInfo);

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Flash Window in Taskbar via Win32 FlashWindowEx:

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http://pietschsoft.com/post/2009/01/26/CSharp-Flash-Window-in-Taskbar-via-Win32-FlashWindowEx.aspx

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Documentation

[FlashWindowEx] on MSDN

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    Private Declare Function FlashWindowEx Lib "User32.dll" (ByRef fwInfo As FLASHWINFO) As Boolean

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        Return FlashWindowEx(fwi)