public enum ExportPages : System.Enum, System.IComparable, System.IConvertible, System.IFormattable  

//Export a map series with multiple pages to a single PDF.

//Create PDF format with appropriate settings
PDFFormat MS_PDF = new PDFFormat()
{
  OutputFileName = filePath,
  Resolution = 300,
  DoCompressVectorGraphics = true,
  DoEmbedFonts = true,
  HasGeoRefInfo = true,
  ImageCompression = ImageCompression.Adaptive,
  ImageQuality = ImageQuality.Best,
  LayersAndAttributes = LayersAndAttributes.LayersAndAttributes
};

//Set up map series export options
MapSeriesExportOptions MS_ExportOptions = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.Custom,  //Provide a specific list of pages
  CustomPages = "1-3, 5",  //Only used if ExportPages.Custom is set
  ExportFileOptions = ExportFileOptions.ExportAsSinglePDF,  //Export all pages to a single, multi-page PDF
  ShowSelectedSymbology = false  //Do no show selection symbology in the output
};

//Export on the worker thread
await QueuedTask.Run(() =>
{
  //Check to see if the path is valid and export
  if (MS_PDF.ValidateOutputFilePath())
  {
    layout.Export(MS_PDF, MS_ExportOptions);  //Export to PDF
  }
});

//Export each page of a map series to an individual TIFF file.

//Create TIFF format with appropriate settings
TIFFFormat TIFF = new TIFFFormat()
{
  OutputFileName = filePath,
  Resolution = 300,
  ColorMode = ColorMode.TwentyFourBitTrueColor,
  HasGeoTiffTags = true,
  HasWorldFile = true,
  TIFFImageCompression = TIFFImageCompression.LZW
};

//Set up map series export options
MapSeriesExportOptions MSExportOptions_TIFF = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.All,  //All pages
  ExportFileOptions = ExportFileOptions.ExportMultipleNames,  //Export each page to an individual file using page name as a suffix.
  ShowSelectedSymbology = true  //Include selection symbology in the output
};

//Export on the worker thread
await QueuedTask.Run(() =>
{
  //Check to see if the path is valid and export
  if (TIFF.ValidateOutputFilePath())
  {
    layout.Export(TIFF, MSExportOptions_TIFF);  //Export to TIFF
  }
});