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public static void GetPreview()
{
    // Create QR code sign options
    QrCodeSignOptions signOptions = new QrCodeSignOptions
    {
        EncodeType = QrCodeTypes.QR,
        Data = new GroupDocs.Signature.Domain.Extensions.Address
        {
            Street = "221B Baker Street",
            City = "London",
            State = "NW",
            ZIP = "NW16XE",
            Country = "England"
        },
        HorizontalAlignment = HorizontalAlignment.Left,
        VerticalAlignment = VerticalAlignment.Center,
        Width = 100,
        Height = 100,
        Margin = new Padding(10)
    };

    // Create signature preview options
    PreviewSignatureOptions previewOption = new PreviewSignatureOptions(
        signOptions, 
        CreateSignatureStream, 
        ReleaseSignatureStream
    )
    {
        SignatureId = Guid.NewGuid().ToString(),
        PreviewFormat = PreviewSignatureOptions.PreviewFormats.JPEG
    };

    // Generate signature preview
    Signature.GenerateSignaturePreview(previewOption);
}

private static Stream CreateSignatureStream(PreviewSignatureOptions previewOptions)
{
    string imageFilePath = 
        $"signature-{previewOptions.SignatureId}-" +
        $"{previewOptions.SignOptions.GetType().Name}.jpg";

    return new FileStream(imageFilePath, FileMode.Create);
}

private static void ReleaseSignatureStream(PreviewSignatureOptions previewOptions, 
    Stream signatureStream)
{
    signatureStream.Dispose();
    Console.WriteLine(
        $"Signature {previewOptions.SignatureId}-" +
        $"{previewOptions.SignOptions.GetType().Name} is ready for preview"
    );
}