windows runtime - Winrt Phone 8.1 Application share task functionality on Page works only once -

i have page in application share simple text, not working properly.

steps produce functionality.

1. go page click share shows application can share.

2. tap button => click again on share button.

3. this not open share screen time.

pasting code below:

    protected override void onnavigatedfrom(navigationeventargs e)     {         _datatransfermanager.datarequested -= ondatarequested;         this.navigationhelper.onnavigatedfrom(e);     }      protected override void onnavigatedto(navigationeventargs e)     {         _datatransfermanager = datatransfermanager.getforcurrentview();         _datatransfermanager.datarequested += ondatarequested;         this.navigationhelper.onnavigatedto(e);     }      private void ondatarequested(datatransfermanager sender, datarequestedeventargs e)     {         e.request.data.properties.title =  obj.title;         htmldocument doc = new htmldocument();         doc.loadhtml(obj.description);         string html = "";         foreach (htmlnode item in doc.documentnode.descendants())         {             if (item.name == "body")             {                 html = item.innerhtml;             }         }         e.request.data.properties.description = html;         e.request.data.settext(html);     }      private void appbarbutton_click_1(object sender, routedeventargs e)     {         //datatransfermanager.showshareui();         if (cmsservice.isconnectedtointernet())         {             datatransfermanager.showshareui();         }         else         {             contenttext.text = app.getresource("nointernetalert");             alertmessage.showasync();         }     } 

and while debugging share works time.

i suspect problem because unsubscribe _datatransfermanager.datarequested -= ondatarequested; in onnavigatedfrom event. work fine when debugging, hence event won't raised - while debuging plm disabled , suspending/resuming events won't raised.

when running app normal, suspension invoke onnavigatedfrom, onnavigatedto won't raised upon resuming, there won't susbscription _datatransfermanager.datarequested += ondatarequested;.

in case can use suspending/resuming (or other) events handle datatransfermanager.