public sealed class ImGearPDFPreflight : ImGearPDFObject 

// Convert a PDF document to PDF/A-2B (2011).
private void SavePdfDocumentAsPDFA2B2011(ImGearPDFDocument pdfDocument, string outputFilePathName)
{
    // Create an ImGearPDFPreflight object from the source ImGearPDFDocument object, pdfDocument.
    using ImGearPDFPreflight preflight = new ImGearPDFPreflight(pdfDocument);
            
    // Create an ImGearPDFPreflightConversionOptions object for profile PDF/A-2B
    // with 300 DPI fallback rasterization resolution.
    using ImGearPDFPreflightConversionOptions options = new ImGearPDFPreflightConversionOptions(
        ImGearPDFPreflightProfile.PDFA_2B_2011, 300);
            
    // Attempt to create a new ImGearPDFDocument object from pdfDoc that is PDF/A-2B compliant.
    ImGearPDFPreflightConversionResult result = preflight.Convert(options);
    try
    {
        // Save the resulting PDF/A-2B compliant ImGearPDFDocument to a file.
        if (result.Succeeded)
        {
            using Stream stream = new FileStream(outputFilePathName, FileMode.Create, FileAccess.Write);
            result.Document.Save(stream, ImGearSavingFormats.PDF, 0, 0, (int)ImGearPDFPageRange.ALL_PAGES,
                ImGearSavingModes.OVERWRITE);
        }
    }
    finally
    {
        // Dispose of the resulting ImGearPDFDocument.
        result.Document?.Dispose();
    }
}