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string strToFind = "\"ipaddress\">";
string requestLine = "";

try
{
    using(HttpWebRequest request = (HttpWebRequest)WebRequest.Create(myWanIp))
    {
        request.Method = "GET";
        response = (HttpWebResponse)request.GetResponse();

        StreamReader reader = new StreamReader(response.GetResponseStream());

        while (!reader.EndOfStream)
        {
            requestLine = reader.ReadLine();
            if (requestLine.Contains(strToFind))
            {
                requestLine = requestLine.Replace("<p class=\"ipaddress\">", "");
                requestLine = requestLine.Replace("</p>", "");
                ExtIPTextBox.Text = requestLine;
                break;
            }
        }
    }
}