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I have a WinForms application that references a data model class library in the same solution. This class library uses Entity Framework 5. So far it works great.

I would also like to reference an external class library that uses Entity Framework 6, but at this point, as expected, I get the System.IO.FileLoadException: Could not load file or assembly 'EntityFramework, Version=6.0.0.0...

From what I understood, I have two options (or maybe more):

1) Upgrade or downgrade one of the two, so they both use the same version of EF (downgrade is probably not a good idea).

2) Make my solution to be able to support both versions (that's my preferred option)

Now at this point I am getting stuck, because I am not sure how I can add references to EF5 and EF6, as both DLLs are called EntityFramework.dll.

I also saw these questions: Different EntityFramework versions in same solution

Could not load file or assembly 'EntityFramework' after downgrading EF 5.0.0.0 --> 4.3.1.0

But it's still not clear to me exactly how to do it. I can see that I need to add a dependent assembly in my app config.

Just to clarify, this is the project structure that I have:

- Main application
- Data model class library (uses EF5 and it is referenced by the Main application)
- External class library (uses EF6 and it is referenced by the Main application)

Is anybody able to help with that?

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  • Possible duplicate of [Loading multiple versions of the same assembly](http://stackoverflow.com/questions/4451220/loading-multiple-versions-of-the-same-assembly) – JotaBe Feb 17 '16 at 10:03
  • @JotaBe Yes, it is a possible duplicate, because I am not sure how to do it for the Entity Framework libraries. – NooooobDeveloper Feb 17 '16 at 11:09

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