protected override void OnKeyDown(KeyEventArgs e)
{
char c = (char)e.KeyCode;
switch (e.KeyCode)
{
case Keys.NumPad7:
c = '7';
break;
case Keys.NumPad8:
c = '8';
break;
case Keys.NumPad9:
c = '9';
break;
}
if (c.IsLetterOrDigit() && !MacAddressHelper.IsAllowed(c))
{
if (e.Modifiers == Keys.None || c != 'C' && c != 'X' && c != 'V')
{
e.Handled = true;
e.SuppressKeyPress = true;
return;
}
}
base.OnKeyDown(e);
}
protected override void OnKeyPress(KeyPressEventArgs e)
{
if (!MacAddressHelper.IsAllowed(e.KeyChar))
{
return;
}
base.OnKeyPress(e);
}