c# - how to run periodic tasks every 5 minutes or more frequently in windows phone 8 -

in wp8 application need download json data every 5 minutes.
in msdn it's written periodic tasks run every 30 minutes.

are there workarounds run periodic tasks in background every 5 minutes?
there other ways of doing without periodic background tasks?

currently i'm using periodic task download json data

here code

public class scheduledagent : scheduledtaskagent {     public string url { get; set; }     private static flightfornotificationdatamodel _flightfornotificationdata;     private static notificationdataviewmodel _notificationdata;      public observablecollection<notificationviewmodel> notifications { get; set; }     /// <remarks>     /// scheduledagent constructor, initializes unhandledexception handler     /// </remarks>     static scheduledagent()     {         // subscribe managed exception handler         deployment.current.dispatcher.begininvoke(delegate         {             application.current.unhandledexception += unhandledexception;         });         _flightfornotificationdata = new flightfornotificationdatamodel("isostore:/tashkentair.sdf");         _notificationdata = new notificationdataviewmodel("isostore:/tashkentair.sdf");     }      /// code execute on unhandled exceptions     private static void unhandledexception(object sender, applicationunhandledexceptioneventargs e)     {         if (debugger.isattached)         {             // unhandled exception has occurred; break debugger             debugger.break();         }     }      /// <summary>     /// agent runs scheduled task     /// </summary>     /// <param name="task">     /// invoked task     /// </param>     /// <remarks>     /// method called when periodic or resource intensive task invoked     /// </remarks>     protected override void oninvoke(scheduledtask task)     {         //todo: add code perform task in background         //notificationsviewmodel notificationdata = new notificationsviewmodel();         //notificationdata.getdata();         getdata();          notifications = new observablecollection<notificationviewmodel>();         //notifycomplete();     }      private void getdata()     {         _flightfornotificationdata.generatenotificationurl();         if (!string.isnullorempty(_flightfornotificationdata.notificationsurl))         {             this.url = _flightfornotificationdata.notificationsurl;             var task = new httpgettask<notifications>(this.url, onpostexecute);              task.execute();         }         else             return;     }      private void onpostexecute(notifications responseobject)     {         this.onnotificationsdownloaded(responseobject);         notifycomplete();     }      private void onnotificationsdownloaded(notifications notifications)     {         if (string.isnullorempty(notifications.hasdata))         {             notifications.clear();             list<notificationviewmodel> notvmlist = new list<notificationviewmodel>();              foreach (tashkentair.models.notification not in notifications.notifications_)             {                 notificationviewmodel notvm = new notificationviewmodel();                 notvm.date = not.date;                 notvm.direction = not.direction;                 notvm.flight_ = not.flight_;                 notvm.time = not.time;                 notvm.timestamp = not.timestamp;                 switch (not.status)                 {                     case 0:                         notvm.status = "Нет данных";                         break;                     case 1:                         notvm.status = "Прибыл";                         _flightfornotificationdata.deleteflightfornotification(not.flightid);                         break;                     case 2:                         notvm.status = "Отправлен";                         break;                     case 3:                         notvm.status = "Регистрация";                         break;                     case 4:                         notvm.status = "Посадка";                         break;                     case 5:                         notvm.status = "Задержан";                         break;                     case 6:                         notvm.status = "Отменен";                         break;                     default:                         notvm.status = "";                         break;                 }                 shelltoast toast = new shelltoast();                 toast.title = notvm.flight_;                 toast.content = notvm.status;                 toast.show();                 notvmlist.add(notvm);             }             notvmlist = notvmlist.orderby(n => n.timestamp).tolist();             notvmlist.foreach(this.notifications.add);             if (_notificationdata == null)                 _notificationdata = new notificationdataviewmodel("isostore:/tashkentair.sdf");             _notificationdata.savejsonnotificationstodb(notifications);         }         else         {             _flightfornotificationdata.clearalldata();             _notificationdata.clearalldata();         }     } } 

but task runs every 30 minutes

json data data flights , information loses actuality in period

so, need make run every 5 minutes or more frequently

how can that?

you can use push notification, or rawnotification dependent on how data needed send. , when app in foreground can accomplish want timer? using background tasks not possible.

toast notifications

server side