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using Microsoft.Web.UI.WebControls;
using ;
using .Collections;
using .ComponentModel;
using .Data;
using .Drawing;
using .Web;
using .Web.SessionState;
using .Web.UI;
using .Web.UI.WebControls;
using .Web.UI.HtmlControls;
using .Data.SqlClient;
test
{
public WebForm1 : .Web.UI.Page
{
protected Microsoft.Web.UI.WebControls.TreeView tv;

private void Page_Load(object sender, .EventArgs e)
{
(!Page.IsPostBack)
{bindtree(tv.Nodes,\"0\");}
}
private void bindtree(TreeNodeCollection Nds , depid)
{
DataSet ds=bindds;//获取DataSet具体代码略
DataView dv=ds.Tables[\"tree\"].DefaultView;
dv.RowFilter=\"HiDepID=\"+depid;
TreeNode tn;
strID;
foreach(DataRowView dr in dv)
{
  strID=dr[\"DepID\"].;
   (strID!=\"\")
  {
   tn= TreeNode;
   tn.ID=dr[\"DepID\"].;
   tn.Text=dr[\"Name\"].;
   Nds.Add(tn);
   bindtree(Nds[Nds.Count-1].Nodes,strID);
  }
}
}
}
}
附
数据库结构:
CREATE TABLE [dbo].[tbDep] (
    [DepID] [small] IDENTITY (1, 1) NOT NULL ,
    [DepName] [varchar] (50) NOT NULL ,
    [HiDepID] [small] NULL ,
)