打开/关闭抽屉的C#代码并同时打印收据？

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        // 打开抽屉
        FileStream fileStream = new FileStream("drawer.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);

        // 写入收据
        StreamWriter writer = new StreamWriter(fileStream);
        writer.WriteLine("Receipt 1");
        writer.WriteLine("Receipt 2");
        writer.Flush();

        // 关闭抽屉
        writer.Close();
        fileStream.Close();

        Console.WriteLine("抽屉已打开并写入收据，已关闭抽屉。");
    }
}