title: "application/json" constant in .NET framework
body: <p>I've just declared a constant for the "application/json" content type in one of my classes.</p>
  
  <pre><code>public const string JsonContentType = "application/json";
  </code></pre>
  
  <p>I'm not sure it is a good practice.</p>
  
  <p>Does .NET framework have a predefined const for "application/json"?</p>