c# - System.Timers Timer not firing event -

i have start timer on event when eyes closed duration.if timer elapsed screen turns off.if eye open before timer elapsed timer stopped , screen turns on.

computationoftimer(); monitors whether eyes open/closed. working fine getting right feedback in console.

            private void computationoftimer()         {             if (blink[0] == 100)        //if eye closed detected             {                 ctrltimerstop = 3;                 ctrltimerstart = ctrltimerstart - 1;                 system.console.write("\n\t eyes closed");                                     timerstarting();             }             else                        //if eyes open before timer elapsed             //we have stop timer             {                 ctrltimerstart = 5;                 ctrltimerstop -= 1;                 //system.console.write("\n\t\t\t\t\t opened");                 timerstopping();             }         } 

timerstarting() starts timer

            public void timerstarting()         {             if (ctrltimerstart == 0)             {                  screenofftimer.interval = 3000;                 screenofftimer.elapsed += screenofftimer_tick_screenoff;                 screenofftimer.autoreset=false;                  if (!screenofftimer.enabled)  //starts timer once                 {                     screenofftimer.enabled = true;                     system.console.write("timer chaloo hai");                 }             }         } 

logic of screen off , sleep

            void screenofftimer_tick_screenoff(object sender, eventargs e)         {             system.console.write("eyes closed long time bro!");             beep(440, 1000); // concert a, 1 second             sendmessage(hwnd_broadcast, wm_syscommand, sc_monitorpower, monitor_off);      //as eyes still closed send pc sleep start 1 more timer              gotosleeptimer.interval = 10000;             gotosleeptimer.elapsed += gotosleeptimer_tick_sleepoff;             gotosleeptimer.autoreset = false;              if (!gotosleeptimer.enabled)             {                 gotosleeptimer.start();             }                          }          void gotosleeptimer_tick_sleepoff(object sender, eventargs e)         {             system.console.write("so rahe hain bhai ab");             beep(440, 2000); // concert a, 1 second             system.windows.forms.application.setsuspendstate(powerstate.suspend, false, false);          } 

timerstopping(); stop timer if eyes opened earlier

            public void timerstopping()     //to stop timer when eyes open         {             if (ctrltimerstop == 0)             {                 //to timer stop logic                 if (screenofftimer.enabled)                 {                     screenofftimer.stop();                     system.console.write("timer band ho gaya");                 }                 //system.windows.messagebox.show("timer stopped");                 sendmessage(hwnd_broadcast, wm_syscommand, sc_monitorpower, monitor_on);                  if (gotosleeptimer.enabled)                 {                     gotosleeptimer.stop();                 }             }          } 

timer not firing after time elapsed.i tried dispatchertimer before update wpf ui , have different objective.

declaration part:

system.timers.timer screenofftimer = new system.timers.timer(); system.timers.timer gotosleeptimer = new system.timers.timer(); 

try

eventtabtimer.elapsed += new elapsedeventhandler(gotosleeptimer_tick_sleepoff);