title: Where do I put my extension method?
body: <p>A senior member here gave me this code:</p>
  
  <pre><code>public static string Truncate(this string value, int maxChars)
  {
      return value.Length &lt;= maxChars ? value : value.Substring(0, maxChars) + " ..";
  }
  </code></pre>
  
  <p>He said to use it as an extension method. But where do I put this method? It looks like it adds something to .Net</p>