private void AddButtonClick(object sender, EventArgs e)
{
string message;
MacAddressMessageBox.TextColor = UIColor.DarkGray;
if (!SignInManager.AddMacAddress(_fullName, _macAddress, out message))
{
MacAddressMessageBox.TextColor = UIColor.Red;
}
else
{
_fullName = string.Empty;
_macAddress = string.Empty;
}
_macAddressMessage = message;
}