beginner C#

hello to all
first thank you all for your help
never programmed in C #

needed a little help with an application of which I have the source code
this source app to run it in command line, and works with commands
this application is to read the highscores Mame32 emulator that are encrypted

the only command you need is the (-r) which serves to read

I need is the following:
1 - when the application starts writing "-r pbaction"
2 - write the result of the highscores in txt file (if any rewriting, if no create)
3 - exit

file for reading is attached with the name of PBACTION.HI

does anyone can help me?

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