I would like to use a later version of ASP.net, I think 9.3.1 runs on ASP.net 3.5 (2.0 base).

I'd like to upgrade the solution to target ASP.Net 4.0 if I could, but don't want to break anything though.

Has anyone tried this yet and if so what were your results? I have source control so I can fix problems if they exist.

Thanks.