title: How to convert string to decimal with 3 decimal places?
body: <pre><code>string num = 23.6;
  </code></pre>
  
  <p>I want to know how can I convert it into decimal with 3 decimal places
  like</p>
  
  <pre><code>decimal nn = 23.600 
  </code></pre>
  
  <p>Is there any method?</p>