dllimport failed to locate dll even though it is in the PATH

Question

I use [Dllimport("DllName.dll")] where I'm sure a path to my dll exists in the process PATH environment variable, and still I get "DllName.dll could not be found"

Answer 1

"DllName.dll could not be found" could also mean that DllImport has not found one of DllName.dll dependencies.

Grab Dependecy Walker to check which dependecy you are missing.