Can't compile Linq after VS 2008 migration

I migrated a VS 2005 asp.net website (not using Linq) to VS 2008. Initially, the website compiled fine, but once I tried to add Linq statements, it would not compile.

I had already done the following to prepare for Linq use:

1) Added in the web.config so System.Core (where Linq lives) would be a reference (copied several of these from a virgin VS 2008 asp.net site)

2) Modified the site Build properties and targeted .NET 3.5

3) Added "using System.Linq"

But it still would not compile...all Linq statements were not recognized (even Intellisense worked). It was like I was still using the .NET 2.0 compiler.

When I looked back at the web.config from a virgin VS 2008 asp.net site, I realized I needed to also have the section. I copied this entire section into my web.config and it now compiles fine (with the .3.5 compiler).

It would have been nice if the conversion tool from VS 2005 to 2008 would have done this for me. I have the first official release of VS 2008.