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Asked: 2026-05-26T17:00:29+00:00

I run a console application which will reference lib.dll . In lib.dll, there is

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I run a console application which will reference lib.dll .

In lib.dll, there is a class called LIB.Common.Rent(string bookName).
So when I add reference lib.dll in my console application, everything is ok.

Intellisense knows everything in lib.dll.

But once I build it, it doesn’t know anything about lib.dll and show the error message
the type or namespace name “LIB” can not be found.

Before I build the application, I can see lib.dll info in object browser.
After I built, I can’t see it anymore.
What is wrong ?

Thanks in advance.

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1 Answer

  1. Editorial Team

    Your Console Application is likely targeting the .net 4 Client Framework (which is a neat idea except that no one uses it, making it useless).

    Right click your Project > Properties and in the Application Tab select “.net Framework 4” instead of “.net Framework 4 Client Framework”. If you are targeting .net 3.5 Client Framework instead, change it to “.net Framework 3.5”.

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