windows mobile做一个rdaserver是否可用的监听线程

Question

        private void check_conn()
        {
                wrq = WebRequest.Create("http://192.168.1.1/rdaserver/sqlcesa35.dll");
                wrs = wrq.GetResponse();
                strm = wrs.GetResponseStream();
                sr = new StreamReader(strm);
                if (sr.ReadLine() == "Microsoft SQL Server Compact Server Agent")
                {
                    label1.Text = "连接成功";
                }
                else
                {
                    label1.Text = "连接失败";
                }
                strm.Close();
        }测试连接的方法
怎么创建一个线程一直在后台上重复监听是否有连接?