You can run your website in both .Net framework 3.5 and 4.0. While opening the website in .Net 4.0, you'll be ask to update your website. Depends upon you, whether you want to update the website or continue using 3.5 only.
Just shift & delete(Remember no backups), then you'll enjoy. ___________________________________________________ A little help through the tips and Articles 1. Application Login through Active Directory (LDAP) 2. Table Valued Parameters
