高手进,帮我看看 这段代码。。总是超时

  public  string OpenReadWithHttps(string URL, string strPostdata, string strEncoding)
    {
        try
        {
            Encoding encoding = Encoding.Default;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
            request.Method = "post";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";
            request.ContentType = "application/x-www-form-urlencoded";
            request.Timeout = 10000000;
            string paraUrlCoded = System.Web.HttpUtility.UrlEncode("username");
            paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode("[email protected] ");
            paraUrlCoded += "&" + System.Web.HttpUtility.UrlEncode("password");
            paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode("123456");
            paraUrlCoded += "&" + System.Web.HttpUtility.UrlEncode("list");
            paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode("1");
            paraUrlCoded += "&" + System.Web.HttpUtility.UrlEncode("submit.x");
            paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode("71");
            paraUrlCoded += "&" + System.Web.HttpUtility.UrlEncode("submit.y");
            paraUrlCoded += "=" + System.Web.HttpUtility.UrlEncode("16");            byte[] buffer;
            //将URL编码后的字符串转化为字节
            buffer = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            //设置请求的ContentLength             //byte[] buffer = encoding.GetBytes(strPostdata);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            string strS = string.Empty;
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), System.Text.Encoding.GetEncoding(strEncoding)))
            {
                strS = reader.ReadToEnd();
            }
            Response.Write(strS);
      
        }
        catch (Exception)
        {
            //return "50";
        }
        return "";
    }///调用
    protected void Button1_Click(object sender, EventArgs e)
    {
        OpenReadWithHttps("http://new.cnzz.com/user/login.php",
               "", "gb2312");
        
    }