Exposed ProcessId on WindowHandle

[palenshus]

In my usage I need to lookup the process ID from the window handle, which I imagine might be a common task. It'd be cool if the WindowHandle already exposed that as a property. I use this to get it:

[DllImport("user32.dll", SetLastError = true)]
public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint processId);