How to call a method from another process by reflection?

Anyone knows calling to a method from another Process by reflection is achievable or not?

I know that we can use reflection to call a method from another EXE/DLL, but in my case I need to call to a method from another Windows Process where that process is connecting to DB, retrieving data then returning data back to my Windows Process. I also reckon that there are several ways for inter-process communication, but just wanted to know whether I can use reflection or not?

Thanks in advance, Kelvin