c# - Windows phone 8 RSS live tile -

im trying show newest feed item text in live tile rss, when run app, there no feed text inside live tile. hope there can help. thanks.

app.xaml.cs:

private void application_launching(object sender, launchingeventargs e)     {         var taskname = "windowsphoneblogsta";         periodictask periodictask = scheduledactionservice.find(taskname) periodictask;         if (periodictask != null)             scheduledactionservice.remove(taskname);          periodictask = new periodictask(taskname) { description = "periodic task update tile of <your app>." };         try         {             scheduledactionservice.add(periodictask); #if debug             scheduledactionservice.launchfortest(taskname, timespan.fromseconds(30)); #endif         }         catch (invalidoperationexception) { }     } 

scheduledagent.cs:

public class scheduledagent : scheduledtaskagent {     /// <remarks>     /// scheduledagent constructor, initializes unhandledexception handler     /// </remarks>     static scheduledagent()     {         // subscribe managed exception handler         deployment.current.dispatcher.begininvoke(delegate         {             application.current.unhandledexception += unhandledexception;         });     }      /// 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)     {         webclient client = new webclient();         client.downloadstringcompleted += (s, e) =>             {                 downloadstringcompleted(s, e);                 notifycomplete();             };         client.downloadstringasync(new uri("http://blogs.windows.com/windows_phone/b/windowsphone/rss.aspx"));     }      private void downloadstringcompleted(object sender, downloadstringcompletedeventargs e)     {         if (e.error == null)         {             stringreader stringreader = new stringreader(e.result);             xmlreader xmlreader = xmlreader.create(stringreader);             syndicationfeed feed = syndicationfeed.load(xmlreader);              var latestarticle = feed.items.firstordefault();             var tile = shelltile.activetiles.firstordefault();             if (tile != null)             {                 var tiledata = new fliptiledata();                 tiledata.title = "windows phone blog";                  var content = latestarticle.title.text + " - " + latestarticle.summary.text;                 var image = new uri("http://imageservice.nordjyske.dk/images/nordjyske.story/2012_07_15/7280794c-78e6-4830-8ea5-e19934f52a55.jpg?maxwidth=500");                  tiledata.backcontent = content;                 tiledata.backgroundimage = image;                  tiledata.widebackcontent = content;                 tiledata.widebackgroundimage = image;                 tile.update(tiledata);             }         }     } }