Add connectionstring in app.config

Question

I have a class library in C# has has several classes and a app.config. I have put ConnectionString in app.config as follows:

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Answer 1

If you are running Web project with Class library, add connection string to web.config inside the Web project

If you are running Console/WinForm project with Class library, add connection string to app.config inside the Console/WinForm project

modifying config in Library project will not work in your case.