Could not load file or assembly "*.dll" , The system cannot find the file specified

Question

Exception screenshot

I am pretty sure the C:/test/AdPlatform.Shared.dll is exist. When I run this in Rider/VisoStudio, it works well. When I try to run it as a system service, it does not work. There is no error and it creates null instance.

Answer 1

Adding custom Reference of Assemblies/DLL in any project will work only in Local Machine, not in other machine/Environments

ADDING THIRD PARTY DLLs IN ANY PROJECT FROM LOCAL PATH IS ALWAYS RISKER

Correct Way:

1. Registering the Custom DLL in GAC then Add the reference from SYSTEM PATH
   
2. For Web service/MVC Related Project(s) creating custom folders(lib) in the Solution itself and adding the DLL from that folder will be the best way to achieve it.

Answer 2

If you want a external library in your solution you need to place its file in a place the solution can access from anywhere (aka deploy location), meaning, put the file in a solution folder and set its using statements to its namespace anywhere you reference it in your project(s), so it will be sure to find the library you need.