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        public static void Download_2(string url, string encoding)
        {
            HttpWebRequest request = null;
            HttpWebResponse response = null;
            CookieContainer _cc = new CookieContainer();
            StreamReader _sr = null;
            string _cookies = string.Empty;
            Encoding _encoding = Encoding.GetEncoding(encoding);
            //
            request = (HttpWebRequest)WebRequest.Create(url);
            request.UserAgent = "Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20100101 Firefox/14.0.1";
            request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            //request.Headers.Add("Accept-Language", "zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");////多国语言
            request.ContentType = "application/x-www-form-urlencoded";
            request.AllowAutoRedirect = true;
            request.CookieContainer = _cc;
            request.KeepAlive = true;
            request.Method = "GET";
            request.KeepAlive = true;
            request.Headers.Add("Cookie:" + _cookies);
            try
            {
                response = (HttpWebResponse)request.GetResponse();
                //设置cookie   
                _cookies = request.CookieContainer.GetCookieHeader(request.RequestUri);
                //取再次跳转链接   
                _sr = new StreamReader(response.GetResponseStream(), _encoding);
                var currentPage = _sr.ReadToEnd();

            }
            catch
            {
                return null;
            }
        }