>You can check the version with:
>
> Environment.Version

Ah. Cool.

>As a general principal I think it's a good idea to speciify a specific version of the CLR that's required with your app and require that. It gets to be a hassle real quick if a version feature isn't supported especially since it's hard to tell what belongs to what version.

Sounds like *very* sound advice. Is it possible for multiple versions of the .NET framework to co-exist? Alternatively, can an app built, say, for version 1.0 run under 1.1? Just thinking ahead to the day when I have a client with existing 1.0 apps, that doesn't want us to deliver a 1.1 app for fear of breaking their existing apps.