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How can I draw outside my WIndow

Platform: WinForms| Category: Win32

You have to get a handle to the desktop and draw on the desktop. This means that whatever you draw will not be automatically refreshed when another window is dragged over it.

	public extern static System.IntPtr GetDC(System.IntPtr hWnd);

	private void button1_Click(object sender, System.EventArgs e)
		System.IntPtr DesktopHandle = GetDC(System.IntPtr.Zero);
		Graphics g = System.Drawing.Graphics.FromHdc(DesktopHandle);
		g.FillRectangle(new SolidBrush(Color.Red),0,0,100,100);

from a microsoft.public.dotnet.framework.windowsforms posting by Lion Shi (MS)

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