本论坛不是有人提供了一个"OA精品"嘛,里面就有现成的比较好的例子:
namespace UDS.Inc
{
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 UDS.Components;
using Microsoft.Web.UI.WebControls;
using System.Configuration;
/// <summary>
/// ClassTreeView 的摘要说明。
/// </summary>
public abstract class ClassTreeView : System.Web.UI.UserControl
{
protected Microsoft.Web.UI.WebControls.TreeView TreeView1;
protected DataTable dataTbl1,dataTbl2;