title: C# 6 how to format double using interpolated string?
body: <p>I have used interpolated strings for messages containing <code>string</code> variables like <code>$&quot;{EmployeeName}, {Department}&quot;</code>. Now I want to use an interpolated string for showing a formatted <code>double</code>.</p>
  <p>Example</p>
  <pre><code>var aNumberAsString = aDoubleValue.ToString(&quot;0.####&quot;);
  </code></pre>
  <p>How can I write it as an interpolated string? Something like <code>$&quot;{aDoubleValue} ....&quot;</code></p>