READ ME FIRST: Minimum OCR sample projects

private static void MergeAndConvertToPdf(IReadOnlyCollection<string> inputFiles)
{
    Console.WriteLine();
    ConsoleHelper.WriteStatus("Converting Files... ");
    using (var documentConverter = new DocumentConverter())
    {
        var firstFile = GetFirst(inputFiles);
        var outputFile = GetNewFilePath(firstFile);
        var loadOptions = new LoadDocumentOptions {UseCache = false};
        var createOptions = new CreateDocumentOptions {UseCache = false};
        documentConverter.SetDocumentWriterInstance(GetDocumentWriter());

        using (var ocrEngine = OcrEngineManager.CreateEngine(OcrEngineType.LEAD, false))
        {
            ocrEngine.Startup(null, null, null, null);
            documentConverter.SetOcrEngineInstance(ocrEngine, false);

            using (var masterDocument = DocumentFactory.Create(createOptions))
            {
                masterDocument.AutoDisposeDocuments = true;
                foreach (var inputFile in inputFiles)
                    masterDocument.Pages.AddRange(DocumentFactory.LoadFromFile(inputFile, loadOptions).Pages);

                var jobData =
                    DocumentConverterJobs.CreateJobData(masterDocument, outputFile, DocumentFormat.Pdf);
                jobData.JobName = "merge and convert job";
                var job = documentConverter.Jobs.CreateJob(jobData);
                documentConverter.Jobs.JobOperation += JobOperationEventHandler;
                documentConverter.Jobs.RunJob(job);
                documentConverter.Jobs.JobOperation -= JobOperationEventHandler;

                DisplayResultMessage(job, outputFile);
            }

            ocrEngine.Shutdown();
        }
    }
}