Question write to separate excel woksheets

[jassie]

I would like to know how to write out excel 2003 excel worksheets to separate files. Basically I need to write out each excel 2003 file generated by a vb.net 2005 desktop application to separate workbooks. Each separate worksheet is going to be email and encrypted for each customer.
Thus I would appreciate any suggestions that you have how to accomplish this task.

Thanks!