C# download yahoo stock quote

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format:
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http://ichart.finance.yahoo.com/table.csv?s=c&a=1&b=1&c=2003&d=1&e=1&f=2011&g=d&ignore=.csv

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c# code:
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            WebClient wc = new WebClient();
            string symbol = "C";
            string url = string.Format(
@"http://ichart.finance.yahoo.com/table.csv?s={0}&a=1&b=1&c=2003&d=1&e=1&f=2011&g=d&ignore=.csv", symbol);

            try
            {
                wc.DownloadFile(url, @"D:/" + symbol + ".csv");
            }
            catch (WebException ex)
            {
                MessageBox.Show(ex.StackTrace);
            }
            finally
            {
                wc.Dispose();
            }

            MessageBox.Show("Done");