title: Windows "ding" sound plays when using ctrl+A in a textbox (C#)
body: <p>It was easy enough to create a text box that supports "ctrl+A" (select all), by listening in on the text box's KeyDown event for an "A" keypress when Control is set to True. When this condition is met, the text box does a call like this:</p>
  
  <pre><code>textBox1.Select(0, textBox1.Text.Length);
  textBox1.ScrollToCaret();
  </code></pre>
  
  <p>The "select all" functionality works well enough, except that I hear the windows "ding" sound when I actually type ctrl+A into my text box when I'm using the application. I can't figure out why.</p>