从csdn上问来的，谢谢stdao(道可道) 老弟，呵呵。

using Microsoft.Web.UI.WebControls;

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;

namespace test

{

public class WebForm1 : System.Web.UI.Page

{

protected Microsoft.Web.UI.WebControls.TreeView tv;

private void Page_Load(object sender, System.EventArgs e)

{

if (!Page.IsPostBack)

{bindtree(tv.Nodes,"0");}

}

private void bindtree(TreeNodeCollection Nds , string depid)

{

DataSet ds=bindds();//获取DataSet，具体代码略

DataView dv=ds.Tables["tree"].DefaultView;

dv.RowFilter="HiDepID="+depid;

TreeNode tn;

string strID;

foreach(DataRowView dr in dv)

{

strID=dr["DepID"].ToString();

if (strID!="")

{

tn=new TreeNode();

tn.ID=dr["DepID"].ToString();

tn.Text=dr["Name"].ToString();

Nds.Add(tn);

bindtree(Nds[Nds.Count-1].Nodes,strID);

}

}

}

}

}

附

数据库结构：

CREATE TABLE [dbo].[tbDep] (

[DepID] [smallint] IDENTITY (1, 1) NOT NULL ,

[DepName] [varchar] (50) NOT NULL ,

[HiDepID] [smallint] NULL ,

)