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Answer 1

+1 A:

This is going to depend on when and where you are going to be distributing. If they are going to be downloading the application you can use this route to setup an ASP.NET page to warn them and even prevent download until they install it.

Otherwise, you would need to look at the registry on the users machine to determine if they have the proper versions. There is another SO question that covers this "How to detect what .NET Framework Version is Installed?"

Mitchel Sellers 2010-03-03 20:53:26

Worth mentioning that the method linked to is not guaranteed to work with browsers other than IE.

Peter Lillevold 2010-03-03 20:57:25

We're going to do the javascript/useragent thing from MSDN, as we don't have access to the registry from an xbap in partial trust, and don't want to have to distribute another application to do the check. We'll just take the support calls from the (probably _very_ few) users not on IE.

hhravn 2010-03-04 08:16:14

Answer 2

A:

Have you considered Environment.Version

  int buildVersion = Environment.Version.Build;
  int majorVersion = Environment.Version.Major;
  int minorVerdion = Environment.Version.Minor;

Asad Butt 2010-03-03 21:00:29

+1 Good one! It's so easy!

Obalix 2010-03-03 22:52:29

This wont work, as it returns the version of the CLR. As the CLR didn't change between framework 2.0, 3.0 and 3.5 the reported version would be 2.0, build 50727.

hhravn 2010-03-04 07:19:03

Answer 3

+1 A:

Take a look at this posting of Scott Hanselman and this link

crauscher 2010-03-03 21:13:43

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Detect framework version 3.5

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