title: Why KeyPressEventArgs's e.Handled does nothing in KeyPressEventArgs C#?
body: <p>This code ( Found through internet ) seems like does nothing at all. How can I prevent non-numeric characters in my <i>TextBox</i></p>
  
  <pre><code>private void textBox1_KeyPress( object sender, KeyPressEventArgs e )
  { 
     if( !char.IsDigit(e.KeyChar) &amp;&amp; !char.IsControl(e.KeyChar) )  
        e.Handled = true;
  }
  </code></pre>
  
  <p>What's the actual purpose of <i>e.Handled</i>? Explanation needed.</p>