TreeView简单使用

学了这么久的.NET了,还没有用过TREEVIEW控件,今天就下了IEWEBCONTROL学了学怎么用TREEVIEW,
写了个简单的二级树.

create table tree
(
id int identity(1,1) primary key,
childID int default 0,--这里定义时写错了，应该用parentID
title varchar(50) not null,
url varchar(100)
)
insert into tree (childID,title,url) values (2,'节点1','http://www.163.com')
insert into tree (childID,title,url) values (0,'节点2','http://www.163.com')
insert into tree (childID,title,url) values (2,'节点3','http://www.163.com')
insert into tree (childID,title,url) values (9,'节点4','http://www.163.com')
insert into tree (childID,title,url) values (2,'节点5','http://www.163.com')
insert into tree (childID,title,url) values (2,'节点6','http://www.163.com')
insert into tree (childID,title,url) values (9,'节点7','http://www.163.com')
insert into tree (childID,title,url) values (9,'节点8','http://www.163.com')
insert into tree (childID,title,url) values (0,'节点9','http://www.163.com')下面是ASP.CS文件

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using Microsoft.Web.UI.WebControls;

namespace xmlDemo