그리고 웹클라이언트 오버라이드해서 쿠키로 로그인유지하며
웹클라이언트의 편리한 업다운기능을 사용할수 있게 됬음..

오오 알아가는 프로그래밍세계는 즐거운듯여

        private void button4_Click(object sender, EventArgs e)
        {
            CookiedWebClient cwc = new CookiedWebClient();
            cwc.mCookieCntainer = cookie;
            textBox1.Text = cwc.DownloadString("uri 쉘라쉘라");
        }
        public class CookiedWebClient : WebClient
        {
            public CookieContainer mCookieCntainer = new CookieContainer();
            protected override WebRequest GetWebRequest(Uri address)
            {
                WebRequest request = base.GetWebRequest(address);
                if (request is HttpWebRequest)
                {
                    (request as HttpWebRequest).CookieContainer = mCookieCntainer;
                }
                return request;
            }
        }