从购物车vb.net中删除项目

嗨 我已经在vb.net中创建了一个购物车，到目前为止，我可以向购物车添加项目，但不能清空或从购物车中删除项目。 有人能帮我吗

这是我目前掌握的代码：-

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" Runat="Server">

 <div id="mycart">
        <br />
    Your shopping cart:<br />
    <table style="width: 500px" align="center" cellspacing="0" 
            cellpadding="0" border="0">
        <tr>
            <td style="width: 286px; height: 153px">
                <asp:ListBox ID="lstCart" runat="server"
                    Width="267px" Height="135px">
                </asp:ListBox>
            </td>
            <td style="height: 153px">
                <asp:Button ID="btnRemove" runat="server"
                    Width="100px" Text="Remove Item" /><br /><br />
                <asp:Button ID="btnEmpty" runat="server" 
                    Width="100px" Text="Empty Cart" />
            </td>
        </tr>
    </table>
    <br />
    <asp:Button ID="btnContinue" runat="server"
        PostBackUrl="~/index.aspx" Text="Continue Shopping" />&nbsp;
    <asp:Button ID="btnCheckOut" runat="server" PostBackUrl="~/CheckOut.aspx" Text="Check Out" /><br />
    <br />
    <asp:Label ID="lblMessage" runat="server"></asp:Label>
</div>

---

期末课程应该是alerady得到的减去每个课程的分数，即：

lstCart.Items.Clear 

编辑：刚刚注意到HTML中的按钮，要使它们正常工作，您需要如下内容：

    Protected Sub btnRemove_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnRemove.Click
        lstCart.Items.Remove(lstCart.SelectedItem)
    End Sub

    Protected Sub btnEmpty_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnEmpty.Click
        lstCart.Items.Clear 
    End Sub

雷内

    Protected Sub btnRemove_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnRemove.Click
        lstCart.Items.Remove(lstCart.SelectedItem)
    End Sub

    Protected Sub btnEmpty_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnEmpty.Click
        lstCart.Items.Clear 
    End Sub