Bitcoin_QR_Popup.Form1.get_amount C# (CSharp) Метод

        private string get_amount()
        {
            string s_local_amount = textBox_amount.Text;
            double local_amount = Convert.ToDouble(s_local_amount);
            double exchange_rate = update_exchange_rate();
            double bitcoin_amount = local_amount * exchange_rate;
            return bitcoin_amount.ToString("0.00000000");
        }