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//For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
public class JpegPhotoParser
{
 
    // absolute path to the GroupDocs.Metadata license file.
    private const string LicensePath = @"GroupDocs.Metadata.lic";

    // absolute path to the photos directory.
    public string PhotosDirectory { get; set; }

    static JpegPhotoParser()
    {
        /* set product license 
         * uncomment following function if you have product license
         * */
        //SetInternalLicense();
    }

    public JpegPhotoParser(string photosDirectory)
    {
        // check if directory exists
        if (!Directory.Exists(Common.MapSourceFilePath( photosDirectory)))
        {
            throw new DirectoryNotFoundException("Directory not found: " + photosDirectory);
        }
        // set property
        this.PhotosDirectory = photosDirectory;
    }

    /// <summary>
    /// Applies the product license
    /// </summary>
    private static void SetInternalLicense()
    { 
        License license = new License();
        license.SetLicense(LicensePath);
    }

    /// <summary>
    /// Takes manufacturer as input and returns photos made on particular camera
    /// </summary>
    /// <param name="manufacturer">Camera manufacturer name</param> 
    public void FilterByCameraManufacturer(string manufacturer)
    {
        // Map directory in source folder
        string sourceDirectoryPath = Common.MapSourceFilePath(this.PhotosDirectory);
        // get jpeg files
        string[] files = Directory.GetFiles(sourceDirectoryPath, "*.jpg");

        List<string> result = new List<string>();

        foreach (string path in files)
        {
            // recognize file
            FormatBase format = FormatFactory.RecognizeFormat(path);

            // casting to JpegFormat
            if (format is JpegFormat)
            {
                JpegFormat jpeg = (JpegFormat)format;

                // get exif data
                JpegExifInfo exif = (JpegExifInfo)jpeg.GetExifInfo();

                if (exif != null)
                {
                    if (string.Compare(exif.Make, manufacturer, StringComparison.OrdinalIgnoreCase) == 0)
                    {
                        // add file path to list
                        result.Add(Path.GetFileName(path));
                    }
                }
            }
        }
        Console.WriteLine(string.Join("\n", result));
    }
}