asp.net attributes ASP.NET Items 属性

<script runat="server">
Sub ClickCheck(sender As Object, e As EventArgs)
  lbl1.Text = "Selected Item(s):<br />"
  Dim i As Integer
  For i = 0 To cb1.Items.Count - 1
    If cb1.Items(i).Selected Then
      lbl1.Text = lbl1.Text & cb1.Items(i).Text & "<br />"
    End If
  Next
End Sub
</script>

<form method="post" runat="server">
<asp:CheckBoxList id="cb1" AutoPostBack="True"
OnSelectedIndexChanged="ClickCheck" runat="server">
  <asp:ListItem Value="Item 1" />
  <asp:ListItem Value="Item 2" />
  <asp:ListItem Value="Item 3" />
  <asp:ListItem Value="Item 4" />
</asp:CheckBoxList>

<br />
<asp:label id="lbl1" runat="server"/>
</form>