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public IEnumerable<PageBarcodeArea> GetBarcodes()

// Create an instance of Parser class
using (Parser parser = new Parser(filePath))
{
    // Extract barcodes from the document.
    IEnumerable<PageBarcodeArea> barcodes = parser.GetBarcodes();

    // Iterate over barcodes
    foreach(PageBarcodeArea barcode in barcodes)
    {
        // Print the page index
        Console.WriteLine("Page: " + barcode.Page.Index.ToString());
        // Print the barcode value
        Console.WriteLine("Value: " + barcode.Value);
    }
}

public IEnumerable<PageBarcodeArea> GetBarcodes(int pageIndex)

// Create an instance of Parser class
using (Parser parser = new Parser(filePath))
{
    // Extract barcodes from the second document page.
    IEnumerable<PageBarcodeArea> barcodes = parser.GetBarcodes(1);

    // Iterate over barcodes
    foreach(PageBarcodeArea barcode in barcodes)
    {
        // Print the page index
        Console.WriteLine("Page: " + barcode.Page.Index.ToString());
        // Print the barcode value
        Console.WriteLine("Value: " + barcode.Value);
    }
}

public IEnumerable<PageBarcodeArea> GetBarcodes(BarcodeOptions options)

// Create an instance of Parser class
using (Parser parser = new Parser(filePath))
{
    // Create the options which are used for barcodes extraction
    BarcodeOptions options = new BarcodeOptions(new Rectangle(new Point(590, 80), new Size(150, 150)));
    // Extract barcodes from the upper-right corner.
    IEnumerable<PageBarcodeArea> barcodes = parser.GetBarcodes(options);

    // Iterate over barcodes
    foreach (PageBarcodeArea barcode in barcodes)
    {
        // Print the page index
        Console.WriteLine("Page: " + barcode.Page.Index.ToString());
        // Print the barcode value
        Console.WriteLine("Value: " + barcode.Value);
    }
}

public IEnumerable<PageBarcodeArea> GetBarcodes(int pageIndex, BarcodeOptions options)