I have an existing web app using a combination of MVC and WebForms on .NET 4.0. I want to upgrade to 4.5 to take advantage of some new features in EF 5 (which require 4.5). A couple of questions to hopefully prevent breaking the live site:
- When I install .NET 4.5 to the hosting server, will it supercede 4.0, or will my 4.0 applications continue to run in 4.0 mode until I change them
- Are there any breaking changes in 4.5 that are likely to throw my 4.0 app offline
- If things go bad, can I backout of having installed 4.5?