after compiling both .cs files as 'test.exe' (for instance), you can run it this way:
test.exe INITIAL_STATE_FILE SURVIVAL BIRTH

Example:
test.exe gosper_glider_gun 23 3

will run the gosper glider gun with the traditional Life rules (S23/B3)

Ctrl + C to quit (yes I'm lazy)

If the game crashes unexpectedly, do not hesitate to send me a mail at 
alexis.vallet@gmail.com with a description of the crash and a stack trace.

Have fun :) !