Try
{
            med=double.Parse(medTextBox.Text);
            sur = double.Parse(surTextBox.Text);
            lab = double.Parse(labTextBox.Text);
            rehab = double.Parse(rehabTextBox.Text);

            miscCharge=CalcMiscCharges(med,sur,lab,rehab);
            totalCharge=CalcStayCharges(days)+CalcMiscCharges(med,sur,lab,rehab);
            totalLabel.Text=totalCharge.ToString();
Catch (Exception e)
{
	Console.WriteLine(e);
}