Hi,
I have authored a book about developing complete applications using
VB.Net and SQL Server 2000. Our effort has been to teach the reader
how to develop complete database applications. (The application we
have considered is an Accounting Application).
Many of the topics like implementing double entry rules, vouchers,
invoices etc have been taught.
If this interests you do visit
http://www.vkinfotek.com, and you will
find a list of topics. If you have any questions, do not hesitate...
Regards
Bharati
http://www.vkinfotek.com 
