Currency is not converting ASP

[WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    [ScriptService]
    public class WebService : System.Web.Services.WebService
    {
        [WebMethod]
        public decimal ConvertGOOG(decimal amount, string fromCurrency, string toCurrency)
        {
            WebClient web = new WebClient();
            //string url = string.Format("http://www.google.com/ig/calculator?hl=en&q={2}{0}%3D%3F{1}", fromCurrency.ToUpper(), toCurrency.ToUpper(), amount);
            Uri uri = new Uri(string.Format("http://www.google.com/ig/calculator?hl=en&q={2}{0}%3D%3F{1}", fromCurrency.ToUpper(), toCurrency.ToUpper(),amount));
            string url = uri.AbsoluteUri + uri.Fragment;
            string response = web.DownloadString(url);
            Regex regex = new Regex("rhs: \\\"(\\d*.\\d*)");
            Match match = regex.Match(response);
            //decimal rate = System.Convert.ToDecimal(regex.Match(response).Groups[1].Value);
            decimal rate = System.Convert.ToDecimal(match.Groups[1].Value);
            return rate;
        }
    }