Why IIS AppPools show V4.0 for SharePoint 2013 running with .net framework V4.5:

  Why IIS AppPools show V4.0 for SharePoint 2013 running with .net framework V4.5:

After, I installed Sharepoint-2013 on my test lab. When I am playing it with. I am confuse by Seeing the IISmanager AppPool Version of SharePoint. I think it should be V 4.5 But still showing V4.0 Like SharePoint 2010.Why?

                                 

  Explanation:

The .NET Framework can version in two ways.

·          Major Version – also called side by side installs

Two different major versions can live together on the same machine.

·         Minor Version – also called “in-place upgrades”

Minor version means the CLR remains the same but new libraries , bug-fixes and/or some other improvements are added to main CLR.

.NET 4.5 is not a major version and so does not add different side-by-side CLR.

·         It will eventually use the same .net framework V4.0CLR and include some additional libraries and Bug fixes/some improvements as well. But it does not add new CLR. I believe new CLR should be the upcoming version.

v Ref Article: http://blogs.msdn.com/b/dotnet/archive/2011/09/26/compatibility-of-net-framework-4-5.aspx

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