This is a bug report for your CSV file saving functionality (using the Workbook class).
As far as I’ve seen, there are two problem to it:
1) When you add a string that contains “\r\n” in a cell, the CSV is not saved correctly. I had to repalce the “\r\n” with “\n” myself.
2) It doesn’t save the byte order mark in the CSV file, and Excel has problems reading the file when it contains Unicode characters. I had to save the file in a MemoryStream and then save it in a file myself with the BOM.
Best Regards,
Kostas.