使用HttpWebRequest抓取網頁

 HttpWebRequest Wr = (HttpWebRequest)WebRequest.Create(http://www./default.html);
        HttpWebResponse response = (HttpWebResponse)Wr.GetResponse();
        Stream receiveStream = response.GetResponseStream();
        StreamReader readStream = new StreamReader(receiveStream, Encoding.Default);
        Label1.InnerHtml  = readStream.ReadToEnd();

        response.Close();
        readStream.Close();

//然後可以用正則表達式分離需要的內容