title: Visual Studio Underscore in Green _ ( not green squiggly)
body: <p>Visual Studio 2013 frequently marks my code with a green _ ( green underscore bar). </p>
  
  <p><img src="https://i.stack.imgur.com/VOwzh.png" alt="enter image description here"></p>
  
  <p>What does it represent and is there a feature that it's linked to, like auto complete or intellisense ?</p>