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

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

private static Stream CreateSignatureStream(PreviewSignatureOptions previewOptions)
{
    SignOptions signOptions = previewOptions.SignOptions;
    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");
}