public string GET2(string URL)
        {
            HttpWebRequest Request = (HttpWebRequest)WebRequest.CreateHttp(URL);//创建httpWebRequest对象
            //设置属性，初始化HttpWebRequest对象
            Request.Method = "GET";
            Request.Timeout = 30000;
            Request.ContentType = "application/x-www-form-urlencoded";
            // 读取服务器的返回信息
            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            //将信息流转换为字符串
            StreamReader Reader = new StreamReader(Response.GetResponseStream(), Encoding.UTF8);
            var as1 = Reader.ReadToEnd();//以字符串形式返回信息流
            Response.Close();//关闭响应释放资源
            Reader.Close();//关闭流，释放资源
            return as1;
        }
        public string POST2(string URL,string DataJSON)
        {
            HttpWebRequest Request = (HttpWebRequest)WebRequest.CreateHttp(URL);//创建httpWebRequest对象
            //设置属性，初始化HttpWebRequest对象
            Request.Method = "POST";
            Request.Timeout = 30000;
            Request.ContentType = "application/x-www-form-urlencoded";
            // 附加要POST给服务器的数据到HttpWebRequest对象 json是键 DataJSON是值
            Stream reqStream = Request.GetRequestStream();
                byte[] byteArray = Encoding.UTF8.GetBytes("json=" + DataJSON);//("json=" + DataJSON+"&name=‘123456‘")传多值
                reqStream.Write(byteArray, 0, byteArray.Length);
                reqStream.Close();
                // 读取服务器的返回信息
            HttpWebResponse Response = (HttpWebResponse)Request.GetResponse();
            //将信息流转换为字符串
            StreamReader Reader = new StreamReader(Response.GetResponseStream(), Encoding.ASCII);
            var as1 = Reader.ReadToEnd();//以字符串形式返回信息流
            Response.Close();
            Reader.Close();
            return as1;
        }