using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;

namespace 檔案加密
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_Encode_Click(object sender, EventArgs e)
        {
            Thread th1 = new Thread(new ThreadStart(EncodingFile));
            th1.Start();
        }
        private void EncodingFile()
        {
            string inf = @txt_source.Text;//原始檔地址
            string outf = @txt_des.Text;//目的檔案地址
            FileInfo fi = new FileInfo(inf);
            progressBar1.

Maximum = (int)fi.Length;
            using (FileStream outstream = new FileStream(@outf, FileMode.Create))
            {
                using (FileStream fs = new FileStream(@inf, FileMode.Open))
                {
                    byte[] bytes = new byte[1024 * 1024 * 10];//10MB
                    int readlength;
                    while ((readlength = fs.Read(bytes, 0, bytes.Length)) > 0)
                    {
                        for (int i = 0; i < readlength; i++)