Ghi file với FileStream

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace DocGhiFile
{
    class Program
    {
        static void Main(string[] args)
        {
            FileStream fs = new FileStream(@"D:\CS\test\leo.txt", FileMode.Create, FileAccess.Write, FileShare.None);
            StreamWriter sw = new StreamWriter(fs);
            Console.WriteLine("Moi ban nhap 1 dong: ");
            string str = Console.ReadLine();
            sw.WriteLine(str);
            sw.Flush();
            sw.Close();
            fs.Close();
        }
    }
}