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We have an application that was built using .NET 3.5. There is a situation where it will run on a machine which only has .NET 4.0 installed.

If in the application configuration file the <supportedRuntime> element is not defined, or is defined as follows

<startup> <supportedRuntime version="v2.0.50727"/> </startup>

will the application crash on start up since .NET 3.5 and CLR v2.0.50727 are not present?

Note I understand that .NET 4.0 APIs are supposed to be compatible with .NET 3.5 ones and that a .NET 3.5 application should run in .NET 4.0. That is not the question. I am specifically asking about the <supportedRuntime> behavior.

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    Yes it will crash. You'll need to add another one with version="v4.0" to make it run on .NET 4 Commented Jan 13, 2012 at 22:35

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Adding Hans Passant's comment as it seems a suitable answer.

The application will crash. To run on .NET 4.0 you need to add another supportedRuntime attribute with version="4.0".

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