title: String Concatenation using '+' operator
body: <p>Looking at the <code>string</code> class metadata, I only see the operators <code>==</code> and <code>!=</code> overloaded. So how is it able to  perform concatenation for the '<code>+</code>' operator?</p>
  
  <p><strong>Edit</strong>:</p>
  
  <p>Some interesting notes from Eric Lippert on string concatenation:</p>
  
  <p><a href="http://ericlippert.com/2013/06/17/string-concatenation-behind-the-scenes-part-one/">Part 1</a></p>
  
  <p><a href="http://ericlippert.com/2013/06/24/string-concatenation-behind-the-scenes-part-two/">Part 2</a></p>
  
  <p>There is also a super article from Joel referred in part 2 (<a href="http://www.joelonsoftware.com/articles/fog0000000319.html">http://www.joelonsoftware.com/articles/fog0000000319.html</a>)</p>