Hi,
The problem here isn't with the WroxUnited app or the book, but it with SQL server 2005 and ASP.NET 2.0. I haven't been able to recreate this problem myself as I didn't have SQL Server 2005, only SQL Express. I've been keeping an eye on newsgroups to see if an authorative fix comes up, but unfortunately no joy. To be honest I've had a lot of problems with Visual Studio 2005 and wouldn't recommend using it with the book, as it certainly needs patching IMO.
I've just received SQL Server 2005, so I will now install and see if I can recreate the problem, however if I can't I'm not sure where I can take it from there. The plain answer is Network Service should be there and it is a bug that it is not.
Chris
Chris Ullman
Programmer/Technical Author
http://www.cuasp.co.uk