C# - VPN Book Passwort auslesen und VPN Verbindung aufbauen

public static void connection()
        {
            string webseite = "http://www.vpnbook.com/freevpn";
            string searchWithinThis = (getHTML(webseite));
            string searchForThis = "Password";
            int firstCharacter = searchWithinThis.IndexOf(searchForThis);
            string pass = searchWithinThis.Substring(firstCharacter + 20, firstCharacter + 8 - firstCharacter);           
            System.Diagnostics.Process.Start("rasdial.exe", "VPNNAME USER "+pass);
        }               

        private static string getHTML(string url)
        {            
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);            
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();             
            StreamReader stream = new StreamReader(response.GetResponseStream());          
            string quelltext = stream.ReadToEnd();  
            stream.Close();
            response.Close();
            return quelltext;
        }