private static string NcPost(string url, string postCont, int timeOut, bool sign)        {            Encoding encoding = Encoding.GetEncoding("gb2312");            byte[] bytesToPost = encoding.GetBytes(postCont);            string cookieheader = string.Empty;            var cookieCon = new CookieContainer();            #region 创建HttpWebRequest对象            var httpRequest = (HttpWebRequest)WebRequest.Create(url);            #endregion            #region 初始化HtppWebRequest对象            httpRequest.CookieContainer = cookieCon;            httpRequest.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022)";            httpRequest.ContentType = "application/x-www-form-urlencoded";            httpRequest.Method = "POST";            httpRequest.Timeout = timeOut * 1000;            if (sign)            {                httpRequest.ContentType = "INFOSEC_SIGN/1.0";                httpRequest.ContentLength = bytesToPost.Length;            }            if (cookieheader.Equals(string.Empty))            {                httpRequest.CookieContainer.GetCookieHeader(new Uri(url));            }            else            {                httpRequest.CookieContainer.SetCookies(new Uri(url), cookieheader);            }            #endregion            string stringResponse = "";            try            {                #region 附加Post给服务器的数据到HttpWebRequest对象                httpRequest.ContentLength = bytesToPost.Length;                Stream requestStream = httpRequest.GetRequestStream();                requestStream.Write(bytesToPost, 0, bytesToPost.Length);                requestStream.Close();                #endregion                #region 读取服务器返回信息                Stream responseStream = httpRequest.GetResponse().GetResponseStream();                if (responseStream != null)                {                    using (                        var responseReader = new StreamReader(responseStream, Encoding.GetEncoding("gbk")))                    {                        stringResponse = responseReader.ReadToEnd();                    }                    responseStream.Close();                }                #endregion            }            catch (Exception ex)            {                stringResponse = ex.ToString();            }            return stringResponse;        }