OpenCVLib2.MainForm.btnVideo_Click C# (CSharp) Method

        private void btnVideo_Click(object sender, EventArgs e)
        {
            double vidWidth, vidHeight;

            if (btnVideo.Text.Equals("Start Video"))
            {
                train_data();

                videoCapture = highgui.CvCreateCameraCapture(0);

                //check bila valid
                if (videoCapture.ptr == IntPtr.Zero)
                {
                    MessageBox.Show("Pengambilan gambar gagal");
                    return;
                }

                btnVideo.Text = "Stop Video";

                highgui.CvSetCaptureProperty(ref videoCapture, highgui.CV_CAP_PROP_FRAME_WIDTH, 640);
                highgui.CvSetCaptureProperty(ref videoCapture, highgui.CV_CAP_PROP_FRAME_HEIGHT, 320);

                highgui.CvQueryFrame(ref videoCapture);

                vidWidth = highgui.cvGetCaptureProperty(videoCapture, highgui.CV_CAP_PROP_FRAME_WIDTH);
                vidHeight = highgui.cvGetCaptureProperty(videoCapture, highgui.CV_CAP_PROP_FRAME_HEIGHT);

                picBoxMain.Width = (int)vidWidth;
                picBoxMain.Height = (int)vidHeight;

                WriteLine("Pengambilan gambar dari webcam dengan resolusi: " + vidWidth.ToString() + " x " + vidHeight.ToString(), true, false);

                timerGrab.Interval = 42;
                timerFPS.Interval = 1100;
                timerGrab.Enabled = true;
                timerFPS.Enabled = true;

                hc = new HaarClassifier(this);
                abs = new AbsDiff(this);
            }
            else
            {
                btnVideo.Text = "Start Video";
                timerFPS.Enabled = false;
                timerGrab.Enabled = false;

                if (videoCapture.ptr != IntPtr.Zero)
                {
                    highgui.CvReleaseCapture(ref videoCapture);
                    videoCapture.ptr = IntPtr.Zero;
                }
            }
        }