asp.net+VS2010实现点菜系统

Default.aspx 源 码如下：

<%@ Page Title="主页" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="WebApplication5._Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <p>
        欢迎光临，请您点菜！</p>
    <p>
        <asp:ListBox ID="lbxSource" runat="server" Height="118px" 
            SelectionMode="Multiple" style="margin-right: 105px" Width="135px">
            <asp:ListItem Value="0">鸡蛋汤</asp:ListItem>
            <asp:ListItem Value="1">海带汤</asp:ListItem>
            <asp:ListItem Value="2">万峦猪脚</asp:ListItem>
            <asp:ListItem Value="3">炸猪排</asp:ListItem>
            <asp:ListItem Value="4">上海醉蟹</asp:ListItem>
            <asp:ListItem Value="5">红烧狮子头</asp:ListItem>
            <asp:ListItem Value="6">排骨炖白菜</asp:ListItem>
        </asp:ListBox>
        <asp:Button ID="btnSelect" runat="server" οnclick="btnSelect_Click" Text="点菜" />
        <asp:Button ID="btnDelete" runat="server" οnclick="btnDelete_Click" 
            style="height: 21px" Text="取消" />
        <asp:ListBox ID="lbxDest" runat="server" Height="118px" 
            SelectionMode="Multiple" style="margin-right: 105px" Width="135px">
        </asp:ListBox>
    </p>
</asp:Content>

设计如图所示：

注意设置listbox属性里的SelectionMode为Multiple（多选）。

Default.aspx.cs 源码如下：

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

namespace WebApplication5
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnSelect_Click(object sender, EventArgs e)
        {
            int count = lbxSource.Items.Count;
            int index = 0;
            for (int i = 0; i < count; i++)
            {
                ListItem Item=lbxSource.Items[index];
                if (lbxSource.Items[index].Selected == true)
                {
                    lbxSource.Items.Remove(Item);
                    lbxDest.Items.Add(Item);
                    index--;
                
                }
                index++;
            
            }
        }

        protected void btnDelete_Click(object sender, EventArgs e)
        {
            int count = lbxDest.Items.Count;
            int index = 0;
            for (int i = 0; i < count; i++)
            {
                ListItem Item = lbxDest.Items[index];
                if (lbxDest.Items[index].Selected == true)
                {
                    lbxDest.Items.Remove(Item);
                    lbxSource.Items.Add(Item);
                    index--;

                }
                index++;

            }

        }
    }
}