Timer Control in C# windows Form -

i using onkeypress event , timer execute method. have textbox, want allow user type server name in text box. traditionally events fires on every key press, put method in timer elapsed events , want timer fire action when user wait 5 seconds. below timer.

      private void tbserver_keypress(object sender, keypresseventargs e)       {           //atimer.stop();           atimer = new system.timers.timer();           atimer.interval = 5000;           atimer.autoreset = false;           if (atimer.enabled)           {               return;           }           else           {               atimer.elapsed += new system.timers.elapsedeventhandler(ontimedevent);               atimer.enabled = true;           }       } 

from above, want timer fire elapsed event if instance of timer not running (i.e ignore key press before 5 seconds interval of timer). stop timer after execution complete in elapsed timer event below

     private void ontimedevent(object source, system.timers.elapsedeventargs e)      {          if (ping(tbserver.text, 1))          {              string txt = "server matched";              settext(txt, true);              atimer.enabled = false;          }          else          {               string txt = " invalid server address";               settext(txt, false);               atimer.enabled = false;           }       } 

the above code rises timer elapsed event each key type regardless of condition. how make ignore keys type when user did not leave 5 seconds interval?

the problem making new timer instance on every click fired after 5 seconds. other timers stop if disable/dispose existing timers.

  if (atimer != null)   {       atimer.stop();       atimer.dispose();       atimer = null;   }    atimer = new system.timers.timer();   atimer.interval = 5000;   atimer.autoreset = false;   if (atimer.enabled)   {       return;   }   else   {       atimer.elapsed += new system.timers.elapsedeventhandler(ontimedevent);       atimer.enabled = true;    }