Как убрать теги?

WebClient webclient = new WebClient();
                var pageSourceCode = webclient.DownloadString("http://en.wikipedia.org/w/api.php?format=xml&action=query&prop=extracts&titles=" + textBox1.Text + "&redirects = true");
                XmlDocument doc = new XmlDocument();
                doc.LoadXml(pageSourceCode);

                var fnode = doc.GetElementsByTagName("extract")[0];

                try
                {
                    string ss = fnode.InnerText;
                    Regex regex = new Regex("\\<[^\\>]^\\>");
                    string.Format("Before:{0}", ss);
                    ss = regex.Replace(ss, string.Empty);
                    string result = string.Format(ss);
                    textBox2.Text = result;
                }