FileText.cs - Đọc Ghi File

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

namespace DocGhiFile
{
    class FileText
    {
        private String _fileName;
        public String FileName
        {
            set
            {
                _fileName = value;
            }
            get
            {
                return _fileName;
            }
        }

        private FileStream fs;

        /// <summary>
        /// Nhap du lieu 3 dong
        /// </summary>
        public void WriteData()
        {
            fs = new FileStream(_fileName, FileMode.Append, FileAccess.Write, FileShare.None);
            StreamWriter sw = new StreamWriter(fs);
            for (int i = 1; i <= 3; i++)
            {
                Console.WriteLine("Moi ban nhap dong thu {0}: ", i);
                String str = Console.ReadLine();
                sw.WriteLine(str);
            }
            sw.Flush();
            sw.Close();
            fs.Close();
        }
        /// <summary>
        /// Doc du lieu
        /// </summary>
        public void ReadData()
        {
            fs = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None);
            StreamReader sr = new StreamReader(fs);
            String str = sr.ReadLine();
            while (str != null)
            {
                Console.WriteLine(str);
                str = sr.ReadLine();
            }
            sr.Close();
            fs.Close();
        }
    }
}