парсер валют

private void button5_Click(object sender, EventArgs e)
        {
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://finance.i.ua/converter/");
                Stream stream = request.GetResponse().GetResponseStream();
                string html = null;
                using (stream)
                {
                    using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding(1251)))
                    {
                        html = reader.ReadToEnd();
                    }
                }
                textBox9.Text = Regex.Replace(Regex.Match(GetDescription(html,
                    "//body/div[2]/div[3]/div[1]/div[1]/div[2]/div[1]/div[1]/table[1]/tbody[1]/tr[1]/td[1]/span[1]/span[1]"),
                    @"(?<=<span>)(.*)(?=</span>)").ToString(), "[.]", ",");
                textBox10.Text = Regex.Replace(Regex.Match(GetDescription(html,
                    "//body/div[2]/div[3]/div[1]/div[1]/div[2]/div[1]/div[1]/table[1]/tbody[1]/tr[1]/td[2]/span[1]/span[1]"),
                    @"(?<=<span>)(.*)(?=</span>)").ToString(), "[.]", ",");
            }
            catch (WebException)
            {
                MessageBox.Show("Не удалось подключиться к сайту", "Ошибка парсера курсов валют.");
            }
        }

        public string GetDescription(string html, string address)
        {
            HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
            doc.OptionFixNestedTags = true;
            doc.Load(new StringReader(html));
            HtmlNode node = doc.DocumentNode.SelectSingleNode(address);
            return node.OuterHtml;
        }