title: Rounding a decimal without fractions doesn't add fractions
body: <p>I have the following code:</p>
  
  <pre><code>var voucherAmountValue = "5";
  var totalValue = Math.Round(Convert.ToDecimal(voucherAmountValue), 2);
  </code></pre>
  
  <p>When I write <code>totalValue</code> to the console, it prints <code>5</code>. I'd expect the fractional digits to be added, printing <code>5.00</code> for <code>totalValue</code>, but it doesn't: it still prints <code>5</code>.</p>
  
  <p>How can I add the fractional digits to a decimal that doesn't have them?</p>