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Will I have any issues if I upgrade from .NET 4.0 to 4.5 [closed]

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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:

  1. 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
  2. Are there any breaking changes in 4.5 that are likely to throw my 4.0 app offline
  3. If things go bad, can I backout of having installed 4.5?
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just.another.programmer Avatar asked Nov 24 '12 20:11

just.another.programmer

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Does installing .NET 4.0 will affect existing .NET applications running on previous versions?

Just like with previous versions. In fact, 4.0 uses completely different directories to store its assemblies in. Uninstalling will prevent you from using older programs. It is however possible to run 2.0+ software using the 4.0 runtime, with some extra configuration in the application config file.

Is .NET framework 4.5 still supported?

Support for . NET Framework versions 4.5. 2, 4.6, and 4.6. 1 ended on April 26, 2022, so security fixes, updates, and technical support for these versions will no longer be provided.

Can you have .NET 3.5 and 4.5 installed?

NET Framework 4.5 (or one of its point releases) runs side by side with versions 1.1, 2.0, and 3.5, and is an in-place update that replaces version 4. For apps that target versions 1.1, 2.0, and 3.5, you can install the appropriate version of . NET Framework on the target machine to run the app in its best environment.

Can I upgrade my .NET Framework?

If you created your app using an earlier version of . NET Framework, you can generally upgrade it to . NET Framework 4.5 and its point releases (4.5.

1 Answers

  1. Once 4.5 is installed then everything that used 4.0 before will use 4.5.
  2. There are a handful of compatibility issues that exist. Elegant Code describes the issue we ran into at work when upgrading to 4.5
  3. You have to uninstall 4.5 and then re install 4.0 in order to back out 4.5.
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Kyle Nunery Avatar answered Oct 23 '22 16:10

Kyle Nunery
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