do a search in the manual on command line

one of the options is this.

Quote:

---

-d name[,value]
Defines the given name for further evaluation in the script through IFDEF. This has the same effect as giving DEFINE name; or DEFINE name,value; within the script. Note that in the second case there must be just a comma, and not any spaces between name and value in the command line. This way, arbitrary game options, like starting screen resolution, difficulty grade etc., can be set via the command line.

---

think this is what your after

look up your c# programming too on passing data direcly into you main() at start of runtime i.e. main ( resolution,bits,d3d_onoff) and what ever.