Download Progressbar

[El]

Ok i need to download data feed file (XML) and it works fine except that i cannot show up the progress bar.

WebClient client = new WebClient();
client.DownloadFile(@"http://feed.sitename.com/page.aspx?param=value", System.IO.Path.Combine(Server.MapPath("~"), "latestdata.xml"));
client.Dispose();

What rad ajax controls i need to use in order to display the progress and where to place my code?

Thanks