webclient 的延时并不好， 所以后来使用的是 WebRequest方式获得代码~

using System.Net;
using System.Text.RegularExpressions;
using System.Web;
using System.IO;

private string getHtml(string url)
{
HttpWebRequest myRequest;
HttpWebResponse myResp = null;
System.IO.StreamReader myReader = null;
myRequest = (HttpWebRequest)WebRequest.Create(url);
myRequest.ReadWriteTimeout = 600 * 1000;
myRequest.Timeout = 600 * 1000;
myRequest.UserAgent = “Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)”;
myRequest.KeepAlive = true;
myResp = (HttpWebResponse)myRequest.GetResponse();
myReader = new System.IO.StreamReader(myResp.GetResponseStream(), Encoding.Default, true);
string html = myReader.ReadToEnd();
myReader.Close();
myResp.Close();
return html;
}

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