private static void Cleanup(PPT.Presentation presentation, PPT.Application powerPointApplication)
        {
            PptPresentationManager.SavePresentationAs(
                presentation,
                Environment.CurrentDirectory + ResourceFolder + OutputFile,
                PPT.PpSaveAsFileType.ppSaveAsOpenXMLPresentation,
                true);

            // Step 100b. Export all slides in the presentation as PNG
            PptSlideManager.ExportAll(
                presentation,
                Environment.CurrentDirectory + ResourceFolder,
                ImageFormats.Formats.png);


            PptPresentationManager.ClosePresentation(presentation);
            PptApplicationManager.ClosePowerPointApplication(powerPointApplication);
        }