title: How to return string "test" and I'm using ?? operator
body: <p>How do I return the string "test"?  I'm using <code>??</code> operator and method <code>GetStringValue</code> returns empty string.</p>
  
  <p>Current value of <code>X</code> is "", but it's should be "test"?</p>
  
  <pre><code>var X = GetStringValue() ?? "test";
  
  private static string GetStringValue()
  {
     return string.Empty;
  }
  </code></pre>