dataAcquisition | Functional Testing library

I am working on a project to make a client program to connect CNC FANUC machine with a personal computer and collect several data using FOCAS library.

After downloading FOCAS library with several dll files and a focas library C# file, I tried to create a program to get the data from the machine based on the instruction of functions in FOCAS library (https://www.inventcom.net/fanuc-focas-library/general/fwlib32).

However, whenever I execute the program, I always face the error saying that "Unhandled exception. System.DllNotFoundException: Unable to load DLL 'FOCAS32.dll' or one of its dependencies(0x8007007E)". I searched on the Google and stackoverflow questions list but nothing has been working.

Could you tell me how to solve this problem?

To elaborate the situation, I made a solution called "FanucCNCDataAcquisition.sln" by using Visual Studio 2019 and I stored two projects: one is FOCASLibrary which has a Focas32.cs for the library purpose and the other is DataAcquisition which has a program.cs for execution with the reference on the focas library. I downloaded several .dll files including FOCAS32.dll and those are not in the same directory with the solution so I am curious if the cause of the problem is based on the location of the files.

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