Asynchronous File Download with Progress Bar

Question

I am attempting to have a progress bar\'s progress change as the WebClient download progress changes. This code still downloads the file yet when I call s

Answer 1

 public class ProgressEventArgsEx
{
    public int Percentage { get; set; }
    public string Text { get; set; }
}
public async static Task DownloadStraingAsyncronous(string url, IProgress progress)
{
    WebClient c = new WebClient();
    byte[] buffer = new byte[1024];
    var bytes = 0;
    var all = String.Empty;
    using (var stream = await c.OpenReadTaskAsync(url))
    {
        int total = -1;
        Int32.TryParse(c.ResponseHeaders[HttpRequestHeader.ContentLength], out total);
        for (; ; )
        {
            int len = await stream.ReadAsync(buffer, 0, buffer.Length);
            if (len == 0)
                break;
            string text = c.Encoding.GetString(buffer, 0, len);

            bytes += len;
            all += text;
            if (progress != null)
            {
                var args = new ProgressEventArgsEx();
                args.Percentage = (total <= 0 ? 0 : (100 * bytes) / total);
                progress.Report(args);
            }
        }
    }
    return all;
}
// Sample
private async void Bttn_Click(object sender, RoutedEventArgs e)
{
    //construct Progress, passing ReportProgress as the Action 
    var progressIndicator = new Progress(ReportProgress);
    await TaskLoader.DownloadStraingAsyncronous(tbx.Text, progressIndicator);
}
private void ReportProgress(ProgressEventArgsEx args)
{
    this.statusText.Text = args.Text + " " + args.Percentage;
}