... BASICSKeyPress and KeyDownTo understand the difference between KeyPress and KeyDown, consider what happens if the user holds down the Shift key and then presses the D key. In this scenario, the KeyPress ... event handler uses the MouseEvent delegate, and provides additional information about the location of the mouse pointer (and the X and Y properties), the mouse wheel movement (Delta), and the state ... e.KeyChar.ToString();}On the other hand, the KeyDown event will fire twice, once for the Shift key, and once for the D key.private void txt_KeyDown(object sender, System .Windows. Forms. KeyEventArgs e){ // Show the...