user interface - C# Ping.Send causing GUI to freeze -

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first time using stackoverflow i'll try best.

i making little app ping servers, issue i'm having gui of program locks while waits response. have far, button_click "ping ip" button, ping_box textbox contain response time, ip_address ip address in form of string.

    private void button_click(object sender, routedeventargs e)     {         stopwatch s = new stopwatch();         s.start();          while (s.elapsed < timespan.fromseconds(2))         {             using (ping p = new ping())             {                 ping_box.text = (p.send(ip_address, 1000).roundtriptime.tostring() + "ms\n");                  if (ping_box.text == "0ms\n")                 {                     ping_box.text = "server offline or exceeds 1000ms.";                 }             }         }         s.stop();     }

so in current state pings ip address repeatedly 2 seconds , puts response time textbox, during time gui locks though. need recorrect want textbox response time update each ping (if response time 500 ms textbox should update 4 times).

i've tried use ping.sendasync not work, pointers or appreciated :)

i think should help... can modify further per needs

private void button1_click(object sender, eventargs e) {     autoresetevent waiter = new autoresetevent(false);     ipaddress ip = ipaddress.parse("192.168.1.2");     var pingsender = new ping();      pingsender.pingcompleted += pingcompletedcallback;     pingsender.sendasync(ip, 1000, waiter); }  private void pingcompletedcallback(object sender, pingcompletedeventargs e) {     // if error occurred, display exception user.      if (e.error != null)     {         messagebox.show(string.format("ping failed: {0}", e.error.tostring()),                          "error", messageboxbuttons.ok, messageboxicon.error);          // let main thread resume.          ((autoresetevent)e.userstate).set();     }      displayreply(e.reply);      // let main thread resume.     ((autoresetevent)e.userstate).set(); }  public void displayreply(pingreply reply) {     if (reply == null)         return;      ping_box.text = string.format("ping status: {0}, roundtrip time: {1}",                                      reply.status,                                     reply.roundtriptime.tostring());  }

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