Fill PDF forms with XFDF data

        /// <summary>
        /// Fill the PDF form <paramref name="templateFileName"/> with data from the XFDF file <paramref name="sourceFile"/>
        /// </summary>
        /// <param name="sourceFile">XFDF data file</param>
        /// <param name="templateFileName">PDF Form template</param>
        /// <param name="serviceURL">Document Converter Services end point</param>
        /// <param name="targetFolder">Destination folder</param>
        static void FillPDFForm(string sourceFile, string templateFileName, string serviceURL, string targetFolder)
        {
            DocumentConverterServiceClient client = null;

            try
            {
                // ** Determine the source file and read it into a byte array.
                Console.WriteLine($"Reading {sourceFile}");
                byte[] dataFile = File.ReadAllBytes(sourceFile);

                // ** Determine the template file and read it into a byte array.
                Console.WriteLine($"Reading {templateFileName}");

                byte[] templateFile = File.ReadAllBytes(templateFileName);

                // ** Open the service and configure the bindings.
                client = OpenService(serviceURL, 255);

                //** Set the absolute minimum open options.
                OpenOptions openOptions = new OpenOptions();
                openOptions.OriginalFileName = Path.GetFileName(sourceFile);
                openOptions.FileExtension = Path.GetExtension(sourceFile);

                // ** Create converter specific settings object and specify template data.
                ConverterSpecificSettings_PdfFormsDataImporter pdfFormsDataImporterSettings = new ConverterSpecificSettings_PdfFormsDataImporter();
                pdfFormsDataImporterSettings.PdfTemplateData = templateFile;

                // ** Set the absolute minimum conversion settings. Also, use the converter specific settings defined above.
                ConversionSettings conversionSettings = new ConversionSettings();
                conversionSettings.Format = OutputFormat.PDF;
                conversionSettings.Fidelity = ConversionFidelities.Full;
                conversionSettings.Quality = ConversionQuality.OptimizeForPrint;
                conversionSettings.ConverterSpecificSettings = pdfFormsDataImporterSettings;
                conversionSettings.PDFProfile = PDFProfile.PDF_A2B;

                // ** Carry out the import.
                Console.WriteLine("Importing data file '" + Path.GetFileName(sourceFile) +
                                  "' into template file '" + Path.GetFileName(templateFileName) + "'");
                byte[] convFile = client.Convert(dataFile, openOptions, conversionSettings);

                // ** Write the result back to the file system with a PDF extension.
                string destinationFileName = Path.GetFullPath(Path.Combine(targetFolder, $"{Path.GetFileNameWithoutExtension(sourceFile)}.{conversionSettings.Format}"));
                using (FileStream fs = File.Create(destinationFileName))
                {
                    fs.Write(convFile, 0, convFile.Length);
                    fs.Close();
                }

                Console.WriteLine($"Result saved to {destinationFileName}");

                // ** Open the generated PDF file in a PDF reader.
                Console.WriteLine("Launching file in PDF Reader");
                Process.Start(destinationFileName);
            }
            catch (FaultException<WebServiceFaultException> ex)
            {
                Console.WriteLine("FaultException occurred: ExceptionType: " +
                                 ex.Detail.ExceptionType.ToString());
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            finally
            {
                CloseService(client);
            }

        }