c# - Windows Phone 8.1 Showing progress view until async/await task finishes -

i have 2 tasks download mp3 web address inside local storage , returns timespan.

 public async task<timespan> filedownload_ignition_outside()             {                 uri sourceignition_outside = new uri(temporaryaddress.download_playcarsound+"ignition_outside"); //download , store file                  return duration_ignition_outside;             }       public async task<timespan> filedownload_idle_outside()     {         uri sourceidle_outside = new uri(temporaryaddress.download_playcarsound +"idle_outside");         storagefile destinationfileidle_outside;        //download , store file          return duration_idle_outside;      } 

now need show indeterminate progressbar in ui while downloading starts till ends dont know how find task completed?

on navigatedto function have set async , calling await downloadfile();

now inside downloadfile()

 public async task<timespan> downloadfiles()             {                 //progressshow                  var temp= await filedownload_ignition_outside();                    //if (filedownload_ignition_outside().iscompleted)                 //{                 //    //progressstop                 //}  return temp;      } 

but not executing stop statement waits asynchronously how can event both task gets finished?
can call both tasks inside downloadfiles() method , still able event both task completion.

try similar code given below in onnavigatedto event.

          showprogress=true;            downloadfiles().continuewith((sender) =>             {                 this.dispatcher.runasync(coredispatcherpriority.normal, () =>                    showprogress=false;                 );             }); 

you need run showprogress=false; in ui thread