app.config for a class library

You generally should not add an app.config file to a class library project; it won’t be used without some painful bending and twisting on your part. It doesn’t hurt the library project at all – it just won’t do anything at all.

Instead, you configure the application which is using your library; so the configuration information required would go there. Each application that might use your library likely will have different requirements, so this actually makes logical sense, too.

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