protected override void Calculate()
        {
            if (textBox_FromUnit.Text != string.Empty)
            {
                TemperatureConverter temperatureConverter = new TemperatureConverter(decimal.Parse(textBox_FromUnit.Text),
                                                                                     comboBox_FromUnit.Text, comboBox_ToUnit.Text);

                textBox_ToUnit.Text = temperatureConverter.ConvertUnit().ToString("#.######");
            }
        }