title: String.Format store double quotes inside string
body: <p>I want to represent the following string:</p>
  
  <pre><code>aaaa,23,"something inside double quotes", 99, 8, 7
  </code></pre>
  
  <p>I was thinking to do this using <code>String.Format</code>:</p>
  
  <pre><code>StringBuilder.AppendLine(string.Format("{0},{1},{2},{3},{4},{5}",
      item.one, item.two, item.three, item.four, item.five, item.six));    
  </code></pre>
  
  <p>I need to wrap third argument <code>{2}</code> with double quotes. </p>