How to get the address of a dll library?

Question

C++ / C#

I am writing a program in C++. I am looking for the address of a dynamic library in order to write to memory later. As I understand it, "mono-2.0-bdwgc.dll changes every time the game is restarted. Please tell me how to get this address. I tried using GetModuleHandle, CreateToolhelp32Snapshot, each time it returned 0
Below is a screen with a cheat engine