c# - Wait for DownloadFileAsync to finish downloading and then do something -

so downloadfile is:

public void downloadfile() {     settings_btn.enabled = false;     label1.text = "checking updates...";     //defines server's update directory     string server = "http://downloadurl/update/";      //defines application root     string root = appdomain.currentdomain.basedirectory;      //make sure version file exists     filestream fs = null;     if (!file.exists("pversion"))     {         using (fs = file.create("pversion")){}         using (streamwriter sw = new streamwriter("pversion")){sw.write("1.0");}     }     //checks client version     string lclversion;     using (streamreader reader = new streamreader("pversion"))     {         lclversion = reader.readline();     }     decimal localversion = decimal.parse(lclversion);      //server's list of updates     xdocument serverxml = xdocument.load(@server + "pupdates.xml");      //the update process     foreach (xelement update in serverxml.descendants("pupdate"))     {         string version = update.element("pversion").value;         string file = update.element("pfile").value;          decimal serverversion = decimal.parse(version);           string surltoreadfilefrom = server + file;          string sfilepathtowritefileto = root + file;          if (serverversion > localversion)         {             using (webclient = new webclient())             {                 webclient.downloadfilecompleted += new asynccompletedeventhandler(completed);                 webclient.downloadprogresschanged += new downloadprogresschangedeventhandler(progresschanged);                  // variable holding url address (making sure starts http://)                 uri url = new uri(surltoreadfilefrom);                  // start stopwatch using calculate download speed                 sw.start();                  try                 {                     // start downloading file                     webclient.downloadfileasync(url, sfilepathtowritefileto);                      // change running executable can overwritten.                     process thisprocess = process.getcurrentprocess();                     string me = thisprocess.mainmodule.filename;                     string bak = me + ".bak";                     if (file.exists(bak))                     {                         file.delete(bak);                     }                     file.move(me, bak);                     file.copy(bak, me);                      //unzip                     using (zipfile zip = zipfile.read(file))                     {                         foreach (zipentry zipfiles in zip)                         {                             zipfiles.extract(root + "\\", true);                         }                     }                      //download new version file                     webclient.downloadfile(server + "pversion.txt", @root + "pversion");                      //delete zip file                     deletefile(file);                      var spawn = process.start(me);                     thisprocess.closemainwindow();                     thisprocess.close();                     thisprocess.dispose();                 }                 catch (exception ex)                 {                     messagebox.show(ex.message);                 }             }         }     } } 

and problem once finds new version , starts downloading file webclient.downloadfileasync(url, sfilepathtowritefileto);, instantly runs code below changing name, unzipping , downloading new version file progress

what want wait finish downloading file, , rest. how do this?

-- in case necessary, progresschanged:

private void progresschanged(object sender, downloadprogresschangedeventargs e) {     label3.text = string.format("{0} kb/s", (e.bytesreceived / 1024d / sw.elapsed.totalseconds).tostring("0.00")) + " " + string.format("{0} mb's / {1} mb's", (e.bytesreceived / 1024d / 1024d).tostring("0.00"), (e.totalbytestoreceive / 1024d / 1024d).tostring("0.00"));;     progressbar1.value = e.progresspercentage;     label1.text = e.progresspercentage.tostring() + "%"; } 

and completed:

private void completed(object sender, asynccompletedeventargs e) {     sw.reset();     if (e.cancelled == true)     {         label1.text = "download cancelled!";     }     else     {         label1.text = "download completed!";     } } 

you can use downloadfile method. async word means method run asynchronous (in other thread), that's why it's goes next line praticaly instantly. if want wait download ends, use downloadfile instead of downloadfileasync