c# - Can we turn on/Off monitor with respect to time intervals in windows 8? -


i using code turn off monitor need turn off/on monitor condition e.g. turn off @ 6.00 pm , turn on @ 7.00 pm, possible? 

    private int sc_monitorpower = 0xf170;      private uint wm_syscommand = 0x0112;      [system.runtime.interopservices.dllimport("user32.dll")]     static extern intptr sendmessage(intptr hwnd, uint msg, intptr wparam, intptr lparam);      enum monitorstate     {         on = -1,         off = 2,         standby = 1     }      private void onmonitor()     {         intptr hwnd = new system.windows.interop.windowinterophelper(this).handle;         sendmessage(hwnd, wm_syscommand, (intptr)sc_monitorpower, (intptr)monitorstate.on);     }       private void offmonitor()     {         intptr hwnd = new system.windows.interop.windowinterophelper(this).handle;         sendmessage(hwnd, wm_syscommand, (intptr)sc_monitorpower, (intptr)monitorstate.off);     }

i not sure whether code working or not, assuming it's working can use kind of timers achieve want turn off monitor @ 6:00 pm 

    system.timers.timer timer = new system.timers.timer();     timespan tsdifference = datetime.parse("06:00 pm").subtract(datetime.now);     timer.interval= (double)((tsdifference.hours * 60 * 60) + (tsdifference.minutes * 60) + (tsdifference.seconds)) * 1000 + (tsdifference.milliseconds);         timer.elapsed += new system.timers.elapsedeventhandler(timer_elapsed);     timer.enabled=true;        void timer_elapsed(object sender, system.timers.elapsedeventargs e)             {                //turn off monitor              }

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