C#获取页面显示的内容

private string GetContentFromUrll(string _requestUrl)
    {
        string _StrResponse = "";
        HttpWebRequest _WebRequest = (HttpWebRequest)WebRequest.Create(_requestUrl);
        _WebRequest.Method = "GET";
        WebResponse _WebResponse = _WebRequest.GetResponse();
        StreamReader _ResponseStream = new StreamReader(_WebResponse.GetResponseStream(), System.Text.Encoding.GetEncoding("gb2312"));
        _StrResponse = _ResponseStream.ReadToEnd();
        _WebResponse.Close();
        _ResponseStream.Close();
        return _StrResponse;
    }