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列表框 HTML代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table width="600" border="1" cellspacing="0" cellpadding="0">
<tr>
<td width="250" rowspan="4">
<asp:ListBox ID="ListBox1" runat="server" Height="300px" SelectionMode="Multiple" Width="243px"></asp:ListBox>
</td>
<td width="100" height="100"> </td>
<td width="250" rowspan="4">
<asp:ListBox ID="ListBox2" runat="server" Height="300px" SelectionMode="Multiple" Width="243px"></asp:ListBox>
</td>
</tr>
<tr>
<td height="50">
<asp:Button ID="Button1" runat="server" Height="36px" OnClick="Button1_Click" Text="->" Width="82px" />
</td>
</tr>
<tr>
<td height="50">
<asp:Button ID="Button2" runat="server" Height="39px" OnClick="Button2_Click" Text=">>" Width="80px" />
</td>
</tr>
<tr>
<td height="100"> </td>
</tr>
</table>
</div>
</form>
</body>
</html>
列表框 后台C#代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
TestDataContext context = new TestDataContext();
ListBox1.DataSource = context.Nation;
ListBox1.DataTextField = "Name";
ListBox1.DataValueField = "Code";
ListBox1.DataBind();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
//找选中项
foreach (ListItem item in ListBox1.Items)
{
if (item.Selected)
{
if (!ListBox2.Items.Contains(item))
{
ListBox2.Items.Add(item);
}
}
}
}
protected void Button2_Click(object sender, EventArgs e)
{
foreach (ListItem item in ListBox1.Items)
{
if (!ListBox2.Items.Contains(item))
{
ListBox2.Items.Add(item);
}
}
}
}
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原文地址：http://www.cnblogs.com/zhuxu/p/5052313.html
