title: How to distinguish InputBox Cancel from OK button?
body: <p>Quick question:</p>
  
  <p>I'm using a <code>Microsoft.VisualBasic.Interaction.InputBox</code> in my C# code to allow users to add websites to a list, but I don't want them to enter an empty string so I give an error popup in case that happens. However, the error will also pop up if the user presses "cancel", which I don't want to happen.</p>
  
  <p>Reading the documentation on it says that pressing "cancel" returns an empty string, hence why it fires the error. Is there a way to still define wether the user pressed "okay" with an empty string or "cancel"?</p>
  
  <p>Thanks in advance,</p>
  
  <p>-Peter</p>