winform 请求网页问题

public static string GetHtml(string uri, string BianMa)

    {

        string result = string.Empty;

        try

        {

            string ip = string.Empty;

            string port = string.Empty;

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(new Uri(uri));

            req.Proxy = null;

            req.Timeout = 10000;

            req.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;

            req.ContentType = "application/x-www-form-DownUrlencoded";

            req.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)";

            HttpWebResponse response = (HttpWebResponse)req.GetResponse();

            Stream ReceiveStream = response.GetResponseStream();

            StreamReader sr = new StreamReader(ReceiveStream, Encoding.GetEncoding(BianMa));

            result = sr.ReadToEnd();

            response.Close();

            ReceiveStream.Close();

            sr.Close();

        }

        catch

        {

            return "";

        }

        return result;

    }

请教各位大牛，程序请求网页，被360检测到，这样被用户看到很不好，有什么办法能解决吗，请求代码如上，用WebBrowser控件也出现同样的情况。。
------解决方案--------------------
是网址有问题吧，你试试baidu.com