Click through transparency for Visual C# Window Forms?

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Creating a top level form that is transparent is very easy. Just make it fill the screen, or required area, and define it to have a TransparenyKey color and BackColor of the same value.

Getting it to ignore the mouse is simple enough, you just need to override the WndProc and tell the WM_HITTEST that all mouse positions are to be treated as transparent. Thus causing the mouse to interact with whatever happens to be underneath the window. Something like this…

    protected override void WndProc(ref Message m)
    {
        if (m.Msg == (int)WM_NCHITTEST)
            m.Result = (IntPtr)HTTRANSPARENT;
        else
            base.WndProc(ref m);
    }

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