How to add these references in VB.net?

Question

I’m not finding these references with the exclamation in Add Reference, does anyone know how to add?

Answer 1

Checks if you are using the same Framework of the version in which you added the references, example: If the reference System.IO for Framework 4.5 and you are in Framework 4, error will result.

Usually these Assembly is automatically added in Visual Studio 2008 up, but if you want to search manually, try these folders:

Para .NET Framework 4.0 pra cima:
C:\Program Files\Reference Assemblies\Microsoft\Framework\.NETFramework\(Versão do seu Framework)\

Para .NET Framework 3.0 ou 3.5:
C:\Program Files\Reference Assemblies\Microsoft\Framework\[v3.5 ou v3.0]\

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If I don’t find them, checks where you downloaded them, and where they are, checks if they exist in place or if they are uncorrupted files, if it is, download again.