OO Programming in ASP.NET C#

Hi,

I have created a .NET content management system in .NET 2.0 using code behind
files for every page(which worked great and the client was well pleased). I now
work for a company that create all their .NET websites/applications using an OO
approach thus compiling classes into dll's/namespaces. This seems massively more
complicated compared with my first .net site and now feel completely lost with
the whole .NET thing. Does anybody now of some great books that demonstarte how
to create web sites using ASP.NET in C# using an OO approach. All the book I
find mention about OO comparing dogs and trees but never seem to give real life
examples. 

Please help!!

Correction:  Dogs and cars.  Trees are a tricky subject for OOP illustrations,
as they don't exhibit much by the way of behaviour.  protected void
ShedLeaves().  Hmmm....

I haven't seen any good books of the sort you are looking for, but this set of
articles will, I'm sure, turn most of your lightbulbs on:
http://imar.spaanjaars.com/QuickDocId.aspx?quickdoc=416 

[Edit]

Almost forgot.  Once you've read those articles, order Marco Bellisano's book. 
It builds on that approach nicely.  It is a good book.