private void Button_Click_2(object sender, RoutedEventArgs e)
{//WebClient client = new WebClient();
//client.DownloadFile(
// "https://www.bankier.pl/inwestowanie/profile/quote.html?symbol=WIG",
// "file.html");
//client.DownloadFile(
//"http://bossa.pl/pub/metastock/mstock/mstall.zip",
//"file2.zip");
var downloadService = singleton.GetDownloadServiceSingleInstance();
downloadService.DownloadFiles();
//Download d = new DownloadFromBossa(new ErrorMessageToFile());
//d.DownloadFile();
//download
}