System.Diagnostics.Process.IsRespondingCore C# (CSharp) Method

        private bool IsRespondingCore()
        {
            const int WM_NULL = 0x0000;
            const int SMTO_ABORTIFHUNG = 0x0002;

            IntPtr mainWindow = MainWindowHandle;
            if (mainWindow == (IntPtr)0)
            {
                return true;
            }

            IntPtr result;
            return Interop.User32.SendMessageTimeout(mainWindow, WM_NULL, IntPtr.Zero, IntPtr.Zero, SMTO_ABORTIFHUNG, 5000, out result) != (IntPtr)0;
        }