opencv .net demo

OpenCV.Net.Capture cap;
        public Form1()
        {
            InitializeComponent();

            while (true)
            {
                cap = OpenCV.Net.Capture.CreateCameraCapture(0);
                IplImage img = cap.QueryFrame();
                //CV.SaveImage("11.jpg",);
                //pictureBox1.Image = Image.FromFile("11.jpg");
                OpenCV.Net.NamedWindow win = new NamedWindow("show");
                win.ShowImage(img);

                int key = CV.WaitKey(30);
                if (key == 27)
                {
                    cap.Close();
                    cap.Dispose();
                }
            }

        }