public bool HasGeoTiffTags {get; set;}

//Export multiple map series pages to TIFF

//Create a TIFF export format
TIFFFormat msTIFF = new TIFFFormat()
{
  Resolution = 300,
  OutputFileName = filePath,
  ColorMode = TIFFColorMode.TwentyFourBitTrueColor,
  HasGeoTiffTags = true,
  HasWorldFile = true
};

//Set up the export options for the map series
MapSeriesExportOptions MSExport_All = new MapSeriesExportOptions()
{
  ExportPages = ExportPages.All,
  ExportFileOptions = ExportFileOptions.ExportMultipleNames,
  ShowSelectedSymbology = false
};

//Check to see if the path is valid and export
if (msPDF.ValidateOutputFilePath())
{
  layout.Export(msPDF, MSExport_All);  //Export each page to a TIFF and apppend the page name suffix to each output file 
}