C# problems...

I'm having problem with some beginner C# stuff. This is due tomorrow and I'm stumped. It Should work.. but isn't...

http://rafb.net/paste/results/81BY8z39.html

hahahaha, i don't think your doAddition function is safe enough, try adding this:

int doDoAddition(int a, int b)
{
    int c;
    c = doAddition(a,b);
    return c;
}