Upgrade to ASP.NET 4 framework

Question

Now that Visual Studio 2010 RC is released I was wondering if anyone knows what pros/cons there are to upgrading my existing ASP.NET applications to target the .NET 4 framework? (Apart from waiting until the Final release which should be even more stable)

Answer 1

If you are not going to rewrite some parts of the application to use new features in ASP.NET 4.0, I don't think there are many benefits. Unless they introduced performance optimizations for already existing functionality, but I don't think you would get those automatically without modifying code.

Otherwise there are plenty of goodies like URL Routing, SEO optimizations, ViewState performance, etc.

Answer 2

At least, you must check if your webserver have support for ASP.NET 4.0 application pools.