抓取页面

示例代码：        Uri uri = new Uri("http://www.wrox.com/");        if (uri.Scheme == Uri.UriSchemeHttp)        {            HttpWebRequest request =(HttpWebRequest) HttpWebRequest.Create(uri);            request.Method = WebRequestMethods.Http.Get;            HttpWebResponse response =(HttpWebResponse)request.GetResponse();            StreamReader read = new StreamReader(response.GetResponseStream());            string tmp = read.ReadToEnd();            response.Close();            Panel1.GroupingText = tmp;        }