Where are my App files?

Hi, I wrote my code via Visual studio 2017.
My app is running as it should.
I know where are my db files.
The question is where are the source code files.
I mean, lets say I lost all my code on the computer, and I would like to retrieve it from the phone...
I know how to retrieve files by adb shell (my phone is rooted). The problem is that I don't know the location.
Thanks for the helper.