Add selected ASP.Net CheckBoxList Items to ASP.Net ListBox on Button click

    <asp:CheckBoxList ID="CheckBoxList1" runat="server">
        <asp:ListItem Text="Bread" Value="10.25" />
        <asp:ListItem Text="Butter" Value="20.00" />
        <asp:ListItem Text="Jam" Value="14.50" />
        <asp:ListItem Text="Eggs" Value="200.00" />
        <asp:ListItem Text="Cake" Value="50.50" />
        <asp:ListItem Text="Fries" Value="14.00" />
    </asp:CheckBoxList>
    <br />
    <asp:ListBox ID="ListBox1" runat="server" SelectionMode = "Multiple"></asp:ListBox>
    <br />
    Total: 
    <asp:Label ID="lblTotal" runat="server" Text=""></asp:Label>
    <br />
    <asp:Button ID="Button1" runat="server" Text="Add" OnClick = "Button1_Click" />

    protected void Button1_Click(object sender, EventArgs e)
    {
        double total = 0;
        ListBox1.Items.Clear();
        foreach (ListItem item in CheckBoxList1.Items)
        {
            if (item.Selected)
            {
                ListBox1.Items.Add(item);
                total += double.Parse(item.Value);
            }
        }
        lblTotal.Text = total.ToString();
    }