title: How do I calculate PI in C#?
body: <p>How can I calculate the value of PI using C#?</p>
  
  <p>I was thinking it would be through a recursive function, if so, what would it look like and are there any math equations to back it up?</p>
  
  <p>I'm not too fussy about performance, mainly how to go about it from a learning point of view.</p>