如何在C#(Epicor，ERP)弹出消息框后保留字段变化？

using System;
using System.Windows.Forms;

public class MainForm : Form
{
    private TextBox textBox;
    private string savedText;

    public MainForm()
    {
        textBox = new TextBox();
        textBox.Location = new System.Drawing.Point(10, 10);
        textBox.Size = new System.Drawing.Size(200, 20);
        this.Controls.Add(textBox);

        Button button = new Button();
        button.Text = "Show Message";
        button.Location = new System.Drawing.Point(10, 40);
        button.Click += new EventHandler(Button_Click);
        this.Controls.Add(button);
    }

    private void Button_Click(object sender, EventArgs e)
    {
        // 保存当前字段值
        savedText = textBox.Text;

        // 弹出消息框
        DialogResult result = MessageBox.Show("Do you want to proceed?", "Confirmation", MessageBoxButtons.YesNo);

        // 恢复字段值
        textBox.Text = savedText;
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MainForm());
    }
}