C#设置右键菜单的方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
  public partial class Form4 : Form
  {
    public Form4()
    {
      InitializeComponent();
    }
    private void cutToolStripMenuItem_Click(object sender, EventArgs e)
    {
      this.textBox1.Cut();
    }
    private void Form4_Load(object sender, EventArgs e)
    {
    }
    private void copyToolStripMenuItem_Click(object sender, EventArgs e)
    {
      this.textBox1.Copy();
    }
    private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
    {
      this.textBox1.Paste();
    }
    private void allSelectToolStripMenuItem_Click(object sender, EventArgs e)
    {
      this.textBox1.SelectAll();
    }
  }
}