Yahoo stock quote from ticker

using System.Net;
using System.IO;
public class TickerQuote
{
  private string ticker;
  private DateTime effective_date;
  public TickerQuote(string t, DateTime dt)
  {
    ticker = t;
    effective_date = dt;
  }
  private string GetTickerAddress()
  {
    DateTime yesterday = effective_date.AddDays(-1);
    return String.Format(
      "http://ichart.finance.yahoo.com/table.csv?" +
      "s={0}&" +
      "d={1}&e={2}&f={3}&" +
      "g=d&a={4}&b={5}&c={6}" +
      "&ignore=.csv",
      ticker,
      effective_date.Month - 1,
      effective_date.Day,
      effective_date.Year,
      yesterday.Month - 1, yesterday.Day, yesterday.Year);
  }
  private string GetFileContents(string fileName)
  {
    using (StreamReader sr = new StreamReader(fileName))
      return sr.ReadToEnd().ToString();
  }
  public double Price
  {
    get
    {
      string fileName = @"C:\temp\table.csv";
      string addr = GetTickerAddress();
      using (WebClient req = new WebClient())
      {
        req.DownloadFile(addr, fileName);
        string result = GetFileContents(fileName);
        System.IO.File.Delete(fileName);
        //  Get the first line
        char[] separator1 = new char[] { '\n' };
        string[] a = result.Split(separator1);
        string b = a[1];
        //  Get the last value on the line
        char[] separator2 = new char[] { ',' };
        string[] bb = b.Split(separator2);
        string price = bb[bb.Length - 1];
        //  Convert to double
        return double.Parse(price);
      }
    }
  }
}