openFileDialog与saveFileDialog的使用

private void btnOpen_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                string fileName = openFileDialog1.FileName;
                txtInfo.Clear();
                txtInfo.Text = File.ReadAllText(fileName);
            }
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                string fileName = saveFileDialog1.FileName;
                File.WriteAllText(fileName, txtInfo.Text);
            }
        }