Hi Greg,
I created a sample to populate 2 columns from 2 DataTables with ;insert. It works fine. Here is the test sample that I used to test this issue:
http://websamples.syncfusion.com/samples/XlsIO.Web/4.4.0.51/f61186/main.htmCould you please take a look at the sample above and kindly let me know if you still find any problem, if not could you please modify this sample so that I can reproduce the issue? This would help me in investigating this issue further. Please let me know if I am missing something.
Thanks,
Melba