title: StringBuilder, append string if conditions are met
body: <pre><code>var sb = new StringBuilder ();
  
  if (condition1) sb.Append ("one");
  if (condition2) sb.Append ("two");
  if (condition3) sb.Append ("three");
  if (condition4) sb.Append ("four");
  if (condition5) sb.Append ("five");
  
  return sb.ToString ();
  </code></pre>
  
  <p>Any idea how to improve it? How to write less code, giving same result?</p>