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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.IO;
using System.Text;
using System.Windows.Forms;
using System.Globalization;
using System.Collections;
 
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            string path = Application.StartupPath + @"\test01.DAT";
 
            //byte配列へ変換
            StreamReader ss = new StreamReader(path, Encoding.GetEncoding("Shift_JIS"));
            string text = ss.ReadToEnd();
            ss.Close();
            byte[] data = Encoding.GetEncoding("Shift_JIS").GetBytes(text);
 
            data[3] = 66;
 
            //上書き更新
            StreamWriter sw = new StreamWriter(path, false, Encoding.GetEncoding("shift_jis"));
            sw.Write(Encoding.GetEncoding("shift_jis").GetString(data));
            sw.Close();
        }
    }
}
 

prog.cs(4,14): error CS0234: The type or namespace name `Data' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(5,14): error CS0234: The type or namespace name `Drawing' does not exist in the namespace `System'. Are you missing an assembly reference?
prog.cs(9,14): error CS0234: The type or namespace name `Windows' does not exist in the namespace `System'. Are you missing an assembly reference?
Compilation failed: 3 error(s), 0 warnings

Standard output is empty