windows phone 8.1 - Multiple files download in WP8.1 -

i developing app holds multiple files download, getting single file @ time.

code implemented on button click download file below:

private async void buttondownload_click_1(object sender, routedeventargs e) {      string uri = "download url****************************";     storagefolder folder = applicationdata.current.localfolder;     if (folder != null)     {         storagefile file = await folder.createfileasync(++fileno + "stvideo.mp4", creationcollisionoption.generateuniquename);         downloadoperation = backgrounddownloader.createdownload(new uri(uri), file);         progress<downloadoperation> progress = new progress<downloadoperation>(progresschanged);         cancellationtoken = new cancellationtokensource();          try         {             textblockstatus.text = "initializing...";             await downloadoperation.startasync().astask(cancellationtoken.token, progress);         }         catch (taskcanceledexception)         {             textblockstatus.text = "download canceled.";             downloadoperation.resultfile.deleteasync().astask().wait();              buttondownload.isenabled = true;             downloadoperation = null;         }     } } 

and progress changed event following:

private void progresschanged(downloadoperation downloadoperation) {     int progress = (int)(100 * ((double)downloadoperation.progress.bytesreceived / (double)downloadoperation.progress.totalbytestoreceive));     textblockprogress.text = string.format("{0} of {1} kb. downloaded - %{2} complete.", downloadoperation.progress.bytesreceived / 1024, downloadoperation.progress.totalbytestoreceive / 1024, progress);     progressbardownload.value = progress;     switch (downloadoperation.progress.status)     {         case backgroundtransferstatus.running:         {             textblockstatus.text = "downloading...";             break;         }         case backgroundtransferstatus.completed:         {             textblockstatus.text = "download complete.";             downloadoperation = null;             break;         }         case backgroundtransferstatus.pausedbyapplication:         {             textblockstatus.text = "download paused.";             break;         }         case backgroundtransferstatus.pausedcostednetwork:         {             textblockstatus.text = "download paused because of metered connection.";             break;         }         case backgroundtransferstatus.pausednonetwork:         {             textblockstatus.text = "no network detected. please check internet connection.";             break;         }         case backgroundtransferstatus.error:         {             textblockstatus.text = "an error occured while downloading.";             break;         }     } } 

but unable come solution download multiple files.

please elaborate me how rid out problem.

thanks

if clicked twice or more - create multiple downloads 1 progress handler. when created download operation item system generates unique id - guid. can determine item downloads in progresschanged

as know:

1. maximum download operations in same moment - 5

2. maximum download operations in queue - 500

update:

i created simple sample background downloading. can download sample onedrive