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Editorial Team
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Asked: 2026-05-28T18:41:54+00:00

We have an application that was built using .NET 3.5. There is a situation

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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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1 Answer

  1. Editorial Team

    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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