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Asked: 2026-06-08T16:44:55+00:00

I have a c# application / solution ( only few classes and files) which

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I have a c# application / solution ( only few classes and files) which is NET 3.5. So under target framework you see 3.5.

But 1 reference (System.Xaml) is from NET 4.0.

And i am not allowed to switch the whole solution to NET 4.0. How can i use System.Xaml (4.0) within a solution targeting 3.5?

edit:
Is it possible to have within 1 solution 2 projects, where one targets NET 3.5 and the other targets 4.0. the point is that within the 3.5 project some other application is “started” which accepts only 3.5

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1 Answer

  1. Editorial Team

    You can’t. It operates on a newer CLR.

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