private static int GetLastInputTime()
        {
            int idleTime = 0;
            var lastInputInfo = new LASTINPUTINFO();
            lastInputInfo.cbSize = Marshal.SizeOf(lastInputInfo);
            lastInputInfo.dwTime = 0;

            int envTicks = Environment.TickCount;

            if (GetLastInputInfo(ref lastInputInfo))
            {
                int lastInputTick = Convert.ToInt32(lastInputInfo.dwTime);

                idleTime = envTicks - lastInputTick;
            }
            int toret = ((idleTime > 0) ? (idleTime/1000) : 0);

            Console.WriteLine(@"Idle time: " + idleTime.ToString());
            Console.WriteLine(toret.ToString());
            return toret;
        }
 private static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);