title: Formatting a string number
body: <p>I want to format a string number. For example:</p>
  
  <pre><code>double number="118176";
  </code></pre>
  
  <p>It should look like 1181.71 or 1181,71.
  I couldn't find any format type. I tried some of format types as <code>ToString("#,0")</code> but it didn't work.</p>
  
  <p>Thanks for any advice.</p>