Creating menu strip at runtime

The code snippet shows how to menu items and event handlers for menu items.

     private void Form1_Load(object sender, EventArgs e)
        {   //menu is created
            MenuStrip menu1 = new MenuStrip();
            //Items for menu r created
            ToolStripMenuItem item = new ToolStripMenuItem("&File");
            item.DropDownItems.Add("&New");
            item.DropDownItems.Add("&Open",null,fileopen);
            item.DropDownItems.Add("&Save",null,filesave);
            item.DropDownItems.Add("&Exit", null, closeandexit);
            //items are added to menu
            menu1.Items.Add(item);
            //menu is added to form
            this.Controls.Add(menu1);
        }
        //event handlers for fileopen,filesave and exit 

        private void fileopen(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "text files | *.txt";
            
            openFileDialog1.ShowDialog();

        }
    
        private void closeandexit(object sender,EventArgs e)
        {
            Application.Exit();
    }

        private void filesave(object sender ,EventArgs e)
        {
            saveFileDialog1.Filter = "text files | *.txt";
            saveFileDialog1.ShowDialog();
            MessageBox.Show("file saved...");

    }