How to detect .NET 4 from ASP.NET?

Question

I have a web server that is run by a third party. I don't have direct access to the server but I can deploy ASP.NET code to it. I want to detect if that server is running ASP.NET 4 / .NET 4 or not. What is the easiest way to do that? Is there an environmental property somewhere that would tell me? Or should I try to load a particular class that only exists in .NET 4?

You'd think that would be easy, wouldn't you? But I have reason to not trust anything they tell me. :-) — RationalGeek
– RationalGeek, Commented Sep 20, 2010 at 14:01

Filip Navara · Accepted Answer · 2010-09-20 13:20:52Z

7

How about printing System.Environment.Version?

answered Sep 20, 2010 at 13:20

Filip Navara

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2 Comments

RationalGeek Over a year ago

That seems to work. I created a stand-alone test page with a <%= System.Environment.Version %> in it. My only question is, let's say I put that in a folder alongside an existing application with a web.config that was for .NET 3.5. What version would it show?

RationalGeek Over a year ago

Nevermind that was a stupid question. It would show whatever version of ASP.NET that IIS virtual folder is configured as.

thr · Accepted Answer · 2010-09-20 13:21:40Z

2

http://msdn.microsoft.com/en-us/library/system.environment.version.aspx

answered Sep 20, 2010 at 13:21

thr

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