C# Vs2005 关闭子窗体时更新父窗体内容，

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 button1_Click(object sender, EventArgs e)
        {
            Form2 InputDialog = new Form2(this);
            InputDialog.ShowDialog(this);
        }

        public void refresh()
        {
            textBox1.Text = "success";
            MessageBox.Show("成功在关闭子窗体时更新了父窗体内容！");
        }
    }
}

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 Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        public Form1 Gz_fm;
        public Form2(Form1 t_Form1)
        {
            InitializeComponent();
            Gz_fm = t_Form1;
        }

        private void Form2_FormClosing(object sender, FormClosingEventArgs e)
        {
            Gz_fm.refresh();
        }
    }
}