The version of .NET against which you compile an application or assembly may not be the same version of .NET on which the application is currently running. A .NET application should always be able to run on the same or newer version of .NET against which it was compiled.

This is because .NET is backward compatible. This means that an application compiled on .NET v1.1 should run OK on .NET v2.0 and v3.0. But an application compiled on .NET v2.0 will not run on .NET v1.1.

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You can use the following JavaScript code in a web page to determine which versions of .NET are installed on a client PC:

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