Coin.CtlSendMoney.textAmount_TextChanged C# (CSharp) Method

        private void textAmount_TextChanged(object sender, TextChangedEventArgs e)
        {
            decimal amount;
            if (decimal.TryParse(textAmount.Text, out amount)) {
                try {
                    labelFee.Content = Wallet.CalcFee(amount).ToString();
                    buttonSend.IsEnabled = true;
                } catch (Exception ex) {
                    labelFee.Content = ex.Message;
                    buttonSend.IsEnabled = false;
                }
            } else
                buttonSend.IsEnabled = false;
        }