int.Parse, Input string was not in a correct format
<p>How would I parse an empty string? <code>int.Parse(Textbox1.text)</code> gives me an error: </p>

<blockquote>
  <p>Input string was not in a correct format.<br>
  System.FormatException: Input string was not in a correct format.</p>
</blockquote>

<p>If the text is empty (<code>Textbox1.text = ''</code>), it throws this error. I understand this error but not sure how to correct this.</p>
