The method writes the document in a conforming PDF format
according to the Conformance property. Any
conformance error is reported in the Errors property after the method
Because of the CLR limit of 2 GB per object, the GetData method cannot return the data for a
document larger than 2 GB. Use this method for documents larger
than 2 GB. Dispose of the returned stream as soon as it is no
longer needed for small memory footprint.