.......

윈도에서 창닫기 버튼 클릭시 창 안닫아지게..

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!m_bClose)
            {
                e.Cancel = true;
                this.Hide();
            }
        }

        // 종료 메시지 처리..

        protected override void WndProc(ref Message m)
        {
            UInt32 nShutDown = 0x11; //LogOff, Shutdown Code

            if (m.Msg == nShutDown)
            {
                m_bClose = true;
            }
            base.WndProc(ref m);
        }