title: How to convert empty string in int32?
body: <p>I'm developing software that grabs data from an html table. So this line:</p>
  
  <pre><code>team.SelectSingleNode(".//td[@class='number total won total_won']")?.InnerText.Trim();
  </code></pre>
  
  <p>returns: <code>""</code></p>
  
  <p>(I'm using html agility pack for DOM manipulation.)</p>
  
  <p>And the complete line is this:</p>
  
  <pre><code>Convert.ToInt32(
    team.SelectSingleNode(
      ".//td[@class='number total won total_won']")
    ?.InnerText.Trim());
  </code></pre>
  
  <p>This returns an exception (incorrect format exception).</p>
  
  <p>Any idea to solve this?</p>