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();

        }