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DotNet: Static Variables in a DLL

I am working on a Dot Net project that includes a DLL. This DLL uses .lib (C code). Unfortunately, there are many static variables in this .lib. I have a problem here:

If two users search at the same time, I get an error because they both access .lib, one changes something, and the other tries to read the data.

The obvious solution would be to block access, but I really do not want to do this, because it significantly slows down the search process. I would prefer to make the DLL from lib, but I do not know if this will solve the problem, since I do not know whether the static variables will be stored separately or if both search processes will access the same variables.

Does anyone have any experience? Because it will take quite a while, and I would like to know if this works before I start doing it.

I hope everything is clear, since English is not my first language, and my programming skills are quite simple.

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From what I understand, you cannot simulate data while reading from it using existing classes in this DLL. Clearly, that just won't work, no matter what kind of fantasy you make.

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