动态数据库实现树状结构.txt

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 System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class Default4 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        // 定义数据库连接
        SqlConnection CN = new SqlConnection();
        try
        {
            //初始化连接字符串
            CN.ConnectionString = ConfigurationManager.AppSettings["ConnStr"];
            CN.Open();

            SqlDataAdapter adp = new SqlDataAdapter("select * from tbTree", CN);
            DataSet ds = new DataSet();
            adp.Fill(ds);
            this.ViewState["ds"] = ds;
        }
        catch (Exception ex)