private void btnAddCoolant_Click(object sender, EventArgs e)
        {
            CoolantSelForm csf = new CoolantSelForm(config);

            csf.ShowDialog();
            if (csf.IsAddCoolant())
            {
                lbCoolant.Items.Add(csf.GetCoolant());
                lbHeaters.Items.Add(csf.GetHeaters());
            }
        }
        private void btnHeaterCount_Click(object sender, EventArgs e)
        {
            if (lbCoolant.SelectedIndex == -1)
            {
                MessageBox.Show("You must select a heater type!");
                return;
            }

            CoolantSelForm csf = new CoolantSelForm(config, lbCoolant.Items[lbCoolant.SelectedIndex].ToString(), double.Parse(lbHeaters.Items[lbHeaters.SelectedIndex].ToString()));

            csf.ShowDialog();
            if (csf.IsAddCoolant())
            {
                int index = lbCoolant.SelectedIndex;
                lbCoolant.Items.RemoveAt(index);
                lbHeaters.Items.RemoveAt(index);
                lbCoolant.Items.Insert(index, csf.GetCoolant());
                lbHeaters.Items.Insert(index, csf.GetHeaters());
            }
        }