Create a Timer and display Error Message once when time's out in C# -

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i want create timer of 20 seconds. when reaches 20 second, pop out error message ok button. after user click ok, close whole application , exit completely.

my code follows. however, error message pop out continuously 5 times within 5 seconds.

how make error message displayed once instead of 5 times?

private void settimerusbport()      { // create timer 20 second interval. atimer = new system.timers.timer(20000);      //timer in ms  atimer.interval = 20000;  // hook elapsed event timer.  atimer.elapsed += ontimedevent; atimer.enabled = true; }  private void ontimedevent(object source, elapsedeventargs e) { dialogresult result; bool display;  display = true;  // check if usb port driver found, progress bar reached max if (detectcommport.isusbportpresent == true) {     buttonautodetectingnext.enabled = true;                                        atimer.stop();     atimer.enabled = false;  }  //if usb port driver not setup , reach 3 minutes: else {      atimer.stop();     atimer.enabled = false;     buttonautodetectingnext.enabled = false;         this.timerprogressbar.enabled = false;       if (display == true)      {         display = false;         if (messagebox.show("a problem detected when attempting configure usb port. \n" +             "please exit setup , reinstall bpro usb drivers. \n can rerun setup process.\n",             "", messageboxbuttons.ok) == dialogresult.ok)             {               // exit application. close down.             application.exit();                  return;         }      } } }

thank help.

cheers, pf


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