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Home/ Questions/Q 7994273
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Editorial Team
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Editorial Team
Asked: June 4, 20262026-06-04T14:05:26+00:00 2026-06-04T14:05:26+00:00

I have created a class library with target framework 4.0 and some classes in

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I have created a class library with target framework 4.0 and
some classes in it that deal with database connections for SQLite.

Now I want to use that class library in another project, to have
it connect to databases, query data, update rows and so on.

But when I “add reference” in the testproject, it seems “empty”,
i.e. in the object catalog, I cannot expand the referenced library.

And when typing the using statement, it says it is not known namespace.

What is wrong? Please help.

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  1. Editorial Team
    Editorial Team
    2026-06-04T14:05:27+00:00Added an answer on June 4, 2026 at 2:05 pm

    Stupid question really but are the classes definitely public in your external assembly?

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