操作treeview树源码

急求对treeview树进行操作的源码，需要动态加载树的. --------------------编程问答-------------------- http://www.cnblogs.com/Fskjb/archive/2009/07/08/1519483.html --------------------编程问答-------------------- private void Form1_Load(object sender, EventArgs e)
        {
            DataTable dt = DBHelp.GetTable("select * from CarType");
            for (int i = 0; i < dt.Rows.Count; i++)
             {
                 TreeNode tn = new TreeNode();
                 tn.Text = dt.Rows[i]["typeName"].ToString();
                 int id = (int)dt.Rows[i]["typeID"];
                 this.treeView1.Nodes.Add(tn);
                 DataTable dt1 = DBHelp.GetTable("select * from CarInfo where typeID='"+id+"'");
                 for (int j = 0; j < dt1.Rows.Count; j++)
                 {
                     TreeNode tn1 = new TreeNode();
                     tn1.Text = dt1.Rows[j]["carName"].ToString();
                     tn.Nodes.Add(tn1);
                 }
      }

 }

补充：.NET技术 ,  ASP.NET