Why KeyPressEventArgs's e.Handled does nothing in KeyPressEventArgs C#?

Question

This code ( Found through internet ) seems like does nothing at all. How can I prevent non-numeric characters in my TextBox

private void textBox1_KeyPress( object sender, KeyPressEventArgs e )
{ 
   if( !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar) )  
      e.Handled = true;
}

What's the actual purpose of e.Handled? Explanation needed.

Answer 1

if you want to prevent non-numeric characters in TextBox then only 1 line is sufficient to handle the event

e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar);