You need to recompile.


>I have an ASP.NET application I developed in VS 2005 in .NET 2.0. I have a web site set on my computer (IIS 7.0) where I can test run this application. I want to see how it "behaves" in .NET 4.0 (prior to upgrading the customer). When I go the IIS properties I can see that I can change the Application Pool for this application from .NET 2.0 to .NET 4.0 (the number are actually long). So if I change the application pool from 2.0 to 4.0, will the application "act" as if it runs in .NET 4.0? Or do I need to recompile the application in VS 2012 for .NET 4.0 to see the full effect?