WinForm窗口关闭提示框

winform 中点击"X"弹出提示是否关闭（退出整个应用程序代码）：

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (e.CloseReason != CloseReason.ApplicationExitCall)
            {
                DialogResult re = MessageBox.Show("确定要退出吗?", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
                if (re == DialogResult.Yes)
                {
                    e.Cancel = false;

                    Application.Exit();
                }
                else
                {
                    e.Cancel = true;
                }
            }
        }