what happen, if write an infinite loop in the method Application_Deactivated(), sent to background and back

private void Application_Deactivated(object sender, DeactivatedEventArgs e)
 {
     Debug.WriteLine("Application_Deactivated");
     Int64 i = 0;
     while (true)
     {
         Debug.WriteLine("{0}", i++);
     }
     PhoneApplicationService.Current.State["LeftTime"] = DateTime.Now;
 }