public Task <List <BookRecDTO> > FetchBookDataAsync(string resourceName, bool useSampleData, CancellationToken cancellationToken)
{
// Use the default value if no value was provided and
// remove the .xml extension if included.
resourceName = NormalizeResourceName(resourceName);
// Open the XML Data Stream for reading.
Stream stream = GetXmlDataStream(resourceName, useSampleData);
// Create an asynchronous task that will...
// parse the XML data file into a list of BookRecDTO objects.
CatalogReader catReader = new CatalogReader();
Task <List <BookRecDTO> > result = catReader.FetchBookDataAsync(stream, cancellationToken);
return(result);
}