How change IIS Express runtime from 4.0 to 2.0?

Question

I'm trying to run using SharpDevelop a MVC2 web app. When I try to run the application, the following error show up in the browser:

Config Error There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined

and ...

If you see the text "There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined", this error is because you are running a .NET Framework 3.5-based application in .NET Framework 4. If you are running WebMatrix, to resolve this problem, go to the Settings node to set the .NET Framework version to ".NET 2". You can also remove the extra sections from the web.config file.

I'm on Windows 7 and have installed WebMatrix but can't figure out how to do what the error message tell me:

set the .NET Framework version to ".NET 2"

How can I change that config to avoid the error?

Answer 1

Here is the command:

appcmd set app /app.name:APPLICATION_NAME/ /applicationPool:Clr2IntegratedAppPool

More info about the command here

Remember change to the right(you could have more than one IIS installed) IIS directory before execute the command,

C:\Program Files\IIS Express

in my case.