private string GetHTML(string url, string cookie)
        {
            if (String.IsNullOrEmpty(url))
            {
                return null;
            }
            else
            {
                try
                {
                    url = url.Replace(" ", "%20");
                    url = url.Replace("&", "&");
                }
                catch
                {
                }

            }

            string html = null;
            string curCookie = null;
            HttpWebRequest myRequest = null;
            HttpWebResponse myResp = null;
            StreamReader myReader = null;

            for (int i = 0; i < 3; i++)
            {

                try
                {
                    myRequest = (HttpWebRequest)WebRequest.Create(url);
                    myRequest.AllowAutoRedirect = false;
                    myRequest.Timeout = 60 * 1000;
                    myRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)";
                    myRequest.Headers.Add("Cookie", cookie);
                    myRequest.KeepAlive = true;
                    myResp = (HttpWebResponse)myRequest.GetResponse();
                    curCookie = myResp.Headers["Set-Cookie"];
                    curCookie = curCookie.Substring(0, curCookie.IndexOf(";"));
                    myReader = new StreamReader(myResp.GetResponseStream(), Encoding.Default, true);
                    html = myReader.ReadToEnd();

                }
                catch (Exception e)
                {
                    // Console.WriteLine(e.ToString());
                    continue;
                }
                finally
                {
                    if (myReader != null)
                    {
                        myReader.Close();
                    }
                    if (myResp != null)
                    {
                        myResp.Close();
                    }

                }

                if (html == null)
                {
                    continue;
                }
                else if (html.IndexOf("Object moved") > 0) //手动获取转向地址,再次获取html代码
                {
                    int pos1 = html.IndexOf("http://");
                    int pos2 = html.IndexOf("\">");
                    url = html.Substring(pos1, pos2 - pos1);
                    html = GetHTML(url, curCookie);
                }

                break;

            }

            return html;
        }