title: ComboBox Event Triggered for the Change -and- Addition of Values
body: <p>Suppose I have a C# .NET windows forms application with a ComboBox that selects string values and also accepts the entry of new values.</p>
  
  <p>What is the most efficient way to trigger a event handling method when either </p>
  
  <ul>
    <li>a preexisting value of the combo box is selected, or </li>
    <li>a <b>newly entered</b> value is typed/entered into the combo box? </li>
  </ul>
  
  <p>I've tried options like the SelectedIndexChanged event, but I can't seem to get things to trigger when there are a newly entered values.  I would assume this is a fairly simple thing to pull of, but I'm not sure.</p>
  
  <p>I could trap for the Enter key, but that seems half-broken assumption that that is what signifies an update.</p>