treeview.aspx中代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="treeview.aspx.cs" Inherits="treeview" %>
<!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>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TreeView ID="TreeView1" runat="server" ImageSet="Msdn" NodeIndent="10">
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle BackColor="#CCCCCC" BorderColor="#888888" BorderStyle="Solid" Font-Underline="True" />
<SelectedNodeStyle BackColor="White" BorderColor="#888888" BorderStyle="Solid" BorderWidth="1px"
Font-Underline="False" HorizontalPadding="3px" VerticalPadding="1px" />
<NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px"
NodeSpacing="1px" VerticalPadding="2px" />
</asp:TreeView>
</div>
</form>
</body>
</html>
treeview.aspx.cs中代码如下：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using Sy
