title: Check if object is NOT of type (!= equivalent for "IS") - C#
body: <p>This works just fine:</p>
  
  <pre><code>    protected void txtTest_Load(object sender, EventArgs e)
      {
          if (sender is TextBox) {...}
  
      }
  </code></pre>
  
  <p>Is there a way to check if sender is NOT a TextBox, some kind of an equivalent of != for "is"?</p>
  
  <p>Please, don't suggest moving the logic to ELSE{} :)</p>