code for cut copy paste in c#

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 Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Dispose();
        }

        private void copyToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Clipboard.SetText(txt.SelectedText);
        }

        private void cutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Clipboard.SetText(txt.SelectedText);

            txt.SelectedText = string.Empty;
        }

        private void pasteToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string xx = Clipboard.GetText();

            txt.Text = txt.Text.Insert(txt.SelectionStart, xx);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            txt.Text = System.IO.File.ReadAllText(@"C:\Data.txt");
        }

        private void wordWrapToolStripMenuItem_Click(object sender, EventArgs e)
        {
            txt.WordWrap = !txt.WordWrap;
        }
    }
}