How do I get .NET 4.0?

Question

I looked up Microsoft .NET 4.0 and I downloaded 2 things. the web installer and client profile but according to the bottom of this picture, I don't have it.

Screenshot of error

The error message is:

Could not load file or assembly App_Code or one of dependencies. This assembly is bui;t by a runtime newer than the currently loaded runtime and cannot be loaded.

1) This looks like ASP.net, so client profile won't be enough 2) It's possible that you have .net 4 installed, but the used runtime is still 2.0. — CodesInChaos, Jul 31 '12 at 09:12
Read the bottom line of the error message: the App Pool is running .NET 2 CLI (ie. V2, V3 or V3.5 framework). — Richard, Jul 31 '12 at 09:15

Jamie Keeling · Answer 1 · 2012-08-01T08:02:32.277

4

Have you checked the value of the '.NET Framework Version' column for your Application Pool via IIS?

Application Pool Config

To change this:

Open IIS Click on the 'Application Pools' level within the tree structure you see on the left hand side of the application
Right click on your application pool in the list and select 'Basic Settings'
Change the value of the 'Net framework version' to be v4.0
Press 'OK' for the changes to be applied and the app pool will recycle ready for use

edited Aug 01 '12 at 08:02

answered Jul 31 '12 at 09:11

Jamie Keeling

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Can you tell me step by step how to do that? – James Aug 01 '12 at 01:15
@James I've updated my post with some basic steps on how to do it :) – Jamie Keeling Aug 01 '12 at 08:02

score 2 · Answer 2 · answered Jul 31 '12 at 09:12

2

An existing web application will continue to run .net 2.0 since the frameworks are installed side-by-side. You have to explicitly configure the app pool to run 4.0.

answered Jul 31 '12 at 09:12

JacquesB

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score 0 · Answer 3 · answered Jul 31 '12 at 09:11

Make sure your application pool in IIS (I assume you're using IIS) is set to .NET 4.0 (it sets itself to 2.0 by default). Failing that you could always try re-registering .NET with IIS:

Open command prompt
Enter the following: C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i
Press enter

score 0 · Answer 4 · edited May 23 '17 at 10:30

0

1st Solution.

2nd Solution

And Make sure your IIS application pool is set to .NET 4.0, for help regarding that.. Check this.

MSDN help

edited May 23 '17 at 10:30

Community

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answered Jul 31 '12 at 09:21

Abhijeetchindhe

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How do I get .NET 4.0?

4 Answers4