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using (Signature signature = new Signature("sample.pdf"))
{
    BarcodeSearchOptions options = new BarcodeSearchOptions()
    {
        // specify special pages to search on
        AllPages = false,
        // single page number
        PageNumber = 1,
        // setup extended search in pages setup
        PagesSetup = new PagesSetup() { FirstPage = true, LastPage = true, OddPages = false, EvenPages = false },
        // specify special barcode type to search
        EncodeType = BarcodeTypes.Code39Standard,
        // specify text match type
        MatchType = TextMatchType.Contains,
        // specify text pattern to search
        Text = "12345678",
        // set field for barcode images returning
        ReturnContent = true,
        // specify type of returned barcode images
        ReturnContentType = FileType.PNG
    };
    // search for signatures in document
    List<BarcodeSignature> signatures = signature.Search<BarcodeSignature>(options);
    Console.WriteLine("\nSource document contains following signatures.");
    foreach (var barcodeSignature in signatures)
    {
        Console.WriteLine("Barcode signature found at page {0} with type {1} and text {2}", barcodeSignature.PageNumber, barcodeSignature.EncodeType, barcodeSignature.Text);
        Console.WriteLine("Barcode signature size {0} and format {1}", barcodeSignature.Content?.Length, barcodeSignature.Format);
        Console.WriteLine($"Location at {barcodeSignature.Left}-{barcodeSignature.Top}. Size is {barcodeSignature.Width}x{barcodeSignature.Height}.");
    }
    //Save Barcode images
    string outputPath = Path.Combine(Constants.OutputPath, "SearchForBarcodeAdvanced");
    if (!Directory.Exists(outputPath))
    {
        Directory.CreateDirectory(outputPath);
    }
    int i = 0;
    foreach (BarcodeSignature barcodeSignature in signatures)
    {
        if (barcodeSignature.Content != null)
        {
            string outputFilePath = Path.Combine(outputPath, $"image{i}{barcodeSignature.Format?.Extension}");
            using (FileStream fs = new FileStream(outputFilePath, FileMode.Create))
            {
                fs.Write(barcodeSignature.Content, 0, barcodeSignature.Content.Length);
            }
        }
        i++;
    }
}