Fenster wirklich in den Vordergrund des Desktops bringen

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[DllImport("User32.dll")]
static extern bool SetForegroundWindow(IntPtr hWnd);

[DllImport("User32.dll")]
public static extern int AttachThreadInput(IntPtr idAttach, IntPtr idAttachTo, bool fAttach);

[DllImport("User32.dll")]
public static extern IntPtr GetForegroundWindow();

[DllImport("User32.dll")]
public static extern IntPtr GetWindowThreadProcessId(IntPtr hwnd, IntPtr lpdwProcessId);

public static void SetForegroundWindowEx(Form window)
{
	IntPtr hndl = window.Handle;
	IntPtr threadID1 = GetWindowThreadProcessId(GetForegroundWindow(), IntPtr.Zero);
	IntPtr threadID2 = GetWindowThreadProcessId(hndl, IntPtr.Zero);
	window.TopMost = true;

	if (threadID1 == threadID2)
	{
		SetForegroundWindow(hndl);
	}
	else
	{
		AttachThreadInput(threadID2, threadID1, true);
		SetForegroundWindow(hndl);;
		AttachThreadInput(threadID2, threadID1, false);
	}
}