Uri uri = new Uri(web_url);

            NameValueCollection values = new NameValueCollection();

            values.Add("username", this.Encrypt(username, key));

            values.Add("password", this.Encrypt(password, key));

            string data = this.PostData(uri, values, true);

private string PostData(Uri uri, NameValueCollection values, [Optional, DefaultParameterValue(true)] bool status)

        {

            try

            {

                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);

                request.Method = "POST";

                request.ContentType = "application/x-www-form-urlencoded";

                request.Accept = "*/*";

                request.Headers.Add("Accept-Encoding: gzip,deflate");

                request.Headers.Add("Accept-Language: zh-cn");

                request.ServicePoint.Expect100Continue = false;

                request.KeepAlive = true;

                request.UserAgent = "Mozilla/5.0 (iPad; CPU OS 6_0 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/6.0 Mobile/10A403 Safari/8536.25";

                if (status)

                {

                    CookieContainer container = new CookieContainer();

                    container.Add(uri, new Cookie("cookie", this.SessionID));

                    //container.Add(uri, new Cookie("Version", this.Version));

                    request.CookieContainer = container;

                }

    &nb