C# 文件流基本操作步骤

private void button1_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("123.txt", FileMode.Append);
StreamWriter ws = new StreamWriter(fs);
ws.WriteLine(this.txtbox.Text = DateTime.Now.ToString()+"  " + "写入成功");
ws.Close();
fs.Close();
}

private void button2_Click(object sender, EventArgs e)
{
FileStream fs = new FileStream("123.txt", FileMode.Open);
StreamReader ws = new StreamReader(fs);
this.txtbox.Text = ws.ReadToEnd();
ws.Close();
fs.Close();
}