private void txbUsername_KeyPress(object sender, KeyPressEventArgs e)
{
if (!char.IsLetterOrDigit(e.KeyChar) && !validatorUtils.IsSpecialCharacter(e.KeyChar) && e.KeyChar != (char)Keys.Back ||
validatorUtils.IsLetterWithAccent(e.KeyChar) || e.KeyChar == 'ª' || e.KeyChar == 'º')
{
e.Handled = true;
}
}