title: What's the difference between 'int?' and 'int' in C#?
body: <p>I am 90% sure I saw this answer on stackoverflow before, in fact I had never seen the "int?" syntax before seeing it here, but no matter how I search I can't find the previous post, and it's driving me crazy.</p>
  
  <p>It's possible that I've been eating the funny mushrooms by accident, but if I'm not, can someone please point out the previous post if they can find it or re-explain it?  My stackoverflow search-fu is apparently too low....</p>