WebRequest wq = WebRequest.Create(this.address);
            HttpWebRequest hq = wq as HttpWebRequest;

            string username = "keguangqiang@163.com";
            string password = "3216731ks";
            string appkey = "5786724301";

            System.Net.CredentialCache cache = new CredentialCache();
            cache.Add(new Uri(this.address), "Basic", new NetworkCredential(username, password));
            hq.Credentials = cache;
            hq.Headers.Add("Authorization","Basic "  Convert.ToBase64String(new System.Text.ASCIIEncoding().GetBytes(username ":" password)));

            System.Net.WebResponse webresponse = hq.GetResponse();
            System.IO.Stream receiveStream = webresponse.GetResponseStream();
            System.IO.StreamReader reader = new System.IO.StreamReader(receiveStream, System.Text.Encoding.UTF8);
            string json = reader.ReadToEnd();