CheckBox Exercise

namespace Zau_CheckBox_Exercise
{

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnGetUserSelection_Click(object sender, EventArgs e)
        {
            string hobbies = String.Empty;
            if (chkSwimming.Checked)
            {
                hobbies += "Swimming \n";
            }
            if (chkSkiing.Checked)
            {
                hobbies += "Skiing \n";
            }
            if (chkBasketBall.Checked)
            {
                hobbies += "Basket Ball \n";
            }
            if (chkGaming.Checked)
            {
                hobbies += "Gaming \n";
            }
            if (chkRunning.Checked)
            {
                hobbies += "Running \n";
            }
            txtDisplay.Text = hobbies;
        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            txtDisplay.Clear();
            txtTotal.Clear();
        }

        private void btnComputeTotal_Click(object sender, EventArgs e)
        {
            double cost = 0;
            string orders = String.Empty;
            if(chkSupreme.Checked)
            {
                orders += "Supreme $15.99 \n";
                cost += 15.99;
            }
            if(chkCheese.Checked)
            {
                orders += "Cheese $14.99 \n";
                cost += 14.99;
            }
            if(chkPeperino.Checked)
            {
                orders += "Peperino $13.99 \n";
                cost += 13.99;
            }
            if(chkVegie.Checked)
            {
                orders += "Vegie $12.99 \n";
                cost += 12.99;
            }
            if(chkSausage.Checked)
            {
                orders += "Sausage $9.99 \n";
                cost += 9.99;
            }
            double tax = cost * 0.098;
            double totalcost = cost + tax;

            txtTotal.Text = ("Order\n")+ orders + String.Format
                ("-----------\nSubTotal: {0:c} \nTax: {1:c} \nTotal Cost: {2:c} \n---------",
                cost, tax, totalcost);
        }
    }
}