复选框中的内容加入listbox

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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="WebForm2.aspx.cs" Inherits="ch.WebForm2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>

<asp:CheckBoxList ID="CheckBoxList1" runat="server">
<asp:ListItem>a</asp:ListItem>
<asp:ListItem>b</asp:ListItem>
<asp:ListItem>c</asp:ListItem>
<asp:ListItem>d</asp:ListItem>
</asp:CheckBoxList>

<br />
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="click" />
<br />
<asp:ListBox ID="ListBox1" runat="server"></asp:ListBox>

</div>
</form>
</body>

</html>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace ch
{
public partial class WebForm2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
this.ListBox1.SelectionMode = ListSelectionMode.Multiple;
}
protected void click(object sender, EventArgs e)
{
int i;
for ( i= 0; i < this.CheckBoxList1.Items.Count;i++ )
{
if (this.CheckBoxList1.Items[i].Selected)
{
ListBox1.Items.Add(CheckBoxList1.Items[i]);
}
}

}

}
}

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