C#

namespace prac_8
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }
        private void button1_Click(object sender, EventArgs e)
        {

            CameraMan cameraMan = new CameraMan(null);
            Console.WriteLine("Found cameras (id, default resolution, automatic settings):");

            foreach (Camera camera in cameraMan.Cameras)
            {
                CameraVideoFormat videoFormat = camera.VideoFormat;
                Console.Write("\t{0}, {1}x{2}x{3:f2}, {4}",
                camera.ID, videoFormat.FrameWidth, videoFormat.FrameHeight,
                videoFormat.FrameRate, camera.AutomaticSettings);
                camera.StartCapturing();
                NImage image = camera.GetCurrentFrame();
                Bitmap bm = image.ToBitmap();
                videoControl.Image = new Bitmap(bm);

            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            Bitmap bm = videoControl.Image;
            NImage image = NImage.FromBitmap(bm);
            NGrayscaleImage grayscale = (NGrayscaleImage)NImage.FromImage(NPixelFormat.Grayscale, 0, image);
            NLExtractor extractor = new NLExtractor();
            NleDetectionDetails details;
            NleExtractionStatus extractionStatus;
            NLTemplate template = extractor.Extract(grayscale, out details, out extractionStatus);

            if (details.FaceAvailable && details.EyesAvailable)
            {
                MessageBox.Show("Found face and eyes!");
            }
            if (extractionStatus != NleExtractionStatus.TemplateCreated)
            {
                MessageBox.Show("Extraction failed!");
                return;
            }

            NLTemplate compressed = extractor.Compress(template);
            if (compressed == null)
            {
                Console.WriteLine("Face template compression failed!");
                return;
            }

            BinaryWriter writer = new BinaryWriter(new FileStream(args[0], FileMode.OpenOrCreate, FileAccess.Write));     //line 81
            writer.Write(compressed.Save());
            writer.Close();


        }



    }
}

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = false)]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

<br />
public class DAO<br />
{<br />
	...<br />
	public void DAO.LoadParentAddress(ref IAddress oAddress)<br />
	{<br />
	...<br />
	// load parent address from database, this is fine, i see oAddress been assigned to correctly.<br />
	oAddress = ....;<br />
	...<br />
	}<br />
	...<br />
}<br />
<br />
public class Program<br />
{<br />
	...<br />
	public void main(...)<br />
	{<br />
	...<br />
		DAO oDAO = new DAO(...);<br />
		IAddress oAddress = (IAddress) Person.ParentAddress;<br />
		oDAO.LoadParentAddress(ref oAddress);<br />
<br />
		// NUnit test/assert<br />
		Assert.IsNotNull(oAddress);				// This is fine.<br />
		Assert.IsNotNull(Person.ParentAddress); // This blow up! Person.ParentAddress is NULL while oAddress is NOT (i.e. oAddress has valid address)?!<br />
	}<br />
	...<br />
}<br />