Mixed mode assembly is built against version ‘v2.0.50727’ of the runtime and cannot be loaded in the 4.0 runtime without additional configuration information.

This error occurs when trying to call MSBuild methods from a WPF form built in .NET4.0 framework.

The fix is to add the following to app.config

<startup useLegacyV2RuntimeActivationPolicy="true">
  <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
</startup></configuration>
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About vijayvepa

I'm a software consultant for Software Specialists Inc. currently working at Philips Respironics, Pittsburgh

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