How can I programatically detect ASP.NET 3.5?

Question

I am creating a diagnostic page for ASP.NET and would like to programatically detect if ASP.NET 3.5 has been installed on the server. Any ideas on how to best do this?

Answer 1

System.Environment.Version gives you the CLR version.
For ASP.NET 2.0, 3.0 and 3.5 it will return the same CLR version: 2.0.50727.3053
As for ASP.NET 4.0 the CLR version will change to 4.*