搞不订了，怎么给Treeview追加节点(windows)

Question

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;namespace WindowsApplication1
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView treeView1;
private System.Windows.Forms.Button button1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null; public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent(); //
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
} /// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null) 
{
components.Dispose();
}
}
base.Dispose( disposing );
} #region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.treeView1 = new System.Windows.Forms.TreeView();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
// 
// treeView1
// 
this.treeView1.ImageIndex = -1;
this.treeView1.Location = new System.Drawing.Point(64, 32);
this.treeView1.Name = "treeView1";
this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
  new System.Windows.Forms.TreeNode("节点0", new System.Windows.Forms.TreeNode[] {
   new System.Windows.Forms.TreeNode("节点6")}),
  new System.Windows.Forms.TreeNode("节点1", new System.Windows.Forms.TreeNode[] {
   new System.Windows.Forms.TreeNode("节点7")}),
  new System.Windows.Forms.TreeNode("节点2", new System.Windows.Forms.TreeNode[] {
   new System.Windows.Forms.TreeNode("节点8")}),
  new System.Windows.Forms.TreeNode("节点3", new System.Windows.Forms.TreeNode[] {
   new System.Windows.Forms.TreeNode("节点9")}),
  new System.Windows.Forms.TreeNode("节点4"),
  new System.Windows.Forms.TreeNode("节点5", new System.Windows.Forms.TreeNode[] {
   new System.Windows.Forms.TreeNode("节点10", new System.Windows.Forms.TreeNode[] {
 new System.Windows.Forms.TreeNode("节点11"),
 new System.Windows.Forms.TreeNode("节点13"),
 new System.Windows.Forms.TreeNode("节点14")})}),
  new System.Windows.Forms.TreeNode("节点12")});
this.treeView1.SelectedImageIndex = -1;
this.treeView1.Size = new System.Drawing.Size(192, 240);
this.treeView1.TabIndex = 0;
this.treeView1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.treeView1_KeyDown);
// 
// button1
// 
this.button1.Location = new System.Drawing.Point(320, 64);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(136, 24);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
// 
// Form1
// 
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(528, 326);
this.Controls.Add(this.button1);
this.Controls.Add(this.treeView1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false); }
#endregion /// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main() 
{
Application.Run(new Form1());
}
private void treeView1_KeyDown(object sender,System.Windows.Forms.KeyEventArgs e)
{ 
if (e.KeyCode==Keys.Return)
{
treeView1.LabelEdit = true;
treeView1.SelectedNode.BeginEdit();
} } private void button1_Click(object sender, System.EventArgs e)
{

}
}
}
在列表上按回车不可以进入编辑状态,然后再回车确认修改,ESC取消