title: How can I define in Visual Studio a new constant?
body: <p>I need to define a new constant in Visual Studio.</p>
  
  <p>I explain: I have a custom Compile Configuration (sorry I'm not sure the name is exact, I have a localized version of VS), and I need to define another constant besides the TRACE and DEBUG ones.</p>
  
  <p>How can I do it?</p>