/// <summary>
    /// 根据Url地址得到网页的html源码  GB2312格式
    /// </summary>
    /// <param name="Url">远程地址</param>
    /// <returns></returns>
    public static string GetWebContent(string Url) {
        string strResult = "";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
        //声明一个HttpWebRequest请求 
        request.Timeout = 30000;
        //设置连接超时时间 
        request.Headers.Set("Pragma", "no-cache");
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream streamReceive = response.GetResponseStream();
        Encoding encoding = Encoding.GetEncoding("GB2312");
        StreamReader streamReader = new StreamReader(streamReceive, encoding);
        strResult = streamReader.ReadToEnd();
        streamReader.Close();
        streamReceive.Close();
        return strResult;
    }