Cell.DateTimeValue throws an exception: "Invalid DateTime Cell"

[GoogleCodeExporter]

What steps will reproduce the problem?

The code tries cast a raw value to double, but if a raw value is decimal then 
an exception will be occurred. But it is ok that an original value is decimal. 
You can just add additional logic for decimal values and it will be fixed.

Thank you.

Original issue reported on code.google.com by xunter...@gmail.com on 7 Dec 2013 at 5:22