c# post方式发送请求

 public static bool CheckNew(string serverIP)
        {
            bool passed = false;
            try
            {
                string url = string.Format("http://{0}/login/index", serverIP);
                //encoding
                Encoding gb2312 = Encoding.GetEncoding("GB2312");
                //创建连接
                HttpWebRequest mHttpRequest = (HttpWebRequest)HttpWebRequest.Create(url);

                //超时间毫秒为单位
                mHttpRequest.Timeout = ;//10s
                //发送请求的方式
                mHttpRequest.Method = "POST";
                //发送的协议
                mHttpRequest.Accept = "HTTP";

                string param = "LoginName=14020801&PassWord=14020801";
                byte[] bs = Encoding.ASCII.GetBytes(param);

                mHttpRequest.ContentType = "application/x-www-form-urlencoded";
                mHttpRequest.ContentLength = bs.Length;
                using (Stream reqStream = mHttpRequest.GetRequestStream())
                {
                    reqStream.Write(bs, , bs.Length);
                    reqStream.Close();
                }

                mHttpRequest.CookieContainer = new CookieContainer();

                //创建一个响应对象
                using (HttpWebResponse mHttpResponse = (HttpWebResponse)mHttpRequest.GetResponse())
                {
                    if (mHttpResponse.StatusDescription == "OK")
                    {
                        //passed = mHttpRequest.Address.AbsolutePath.Contains("Index");
                        passed = true;
                    }
                    else
                    {
                        passed = false;
                    }
                    mHttpResponse.Close();
                }
            }
            catch { }

            return passed;
        }