?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.Security.Cryptography;
using System.IO;
using System.Globalization;
namespace Encrypt
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            String text = this.richTextBox1.Text;
            if (text.Trim().Length == 0)
            {
                MessageBox.Show("請輸入要加密或解密的字符！", "系統提示");
                return;
            }
            try
            {
                String temp = Convert.ToBase64String(System.Text.Encoding.Default.GetBytes(text)).Replace("+", "%2B");
                temp = temp.Insert(1, "Q");
                temp.Substring(0, 1);
                this.richTextBox2.Text = temp;
            }
            catch (Exception ex)
            {

                MessageBox.Show("解密失敗，請確認你輸入的加密字符是否正確！", "系統提示");
            }

        }
        private void button2_Click(object sender, EventArgs e)
        {
            String text = this.richTextBox1.Text;
            if (text.Trim().Length == 0)
            {
                MessageBox.Show("請輸入要加密或解密的字符！", "系統提示");
                return;
            }
            try
            {
                text = text.Remove(1, 1);
                this.richTextBox2.Text = System.Text.Encoding.Default.GetString(Convert.FromBase64String(text.Replace("%2B", "+")));
            }
            catch (Exception ex)
            {
                MessageBox.Show("解密失敗，請確認你輸入的解密字符是否正確！", "系統提示");
            }

        }

        private void button3_Click(object sender, EventArgs e)
        {
            AboutBox1 about = new AboutBox1();
            about.ShowDialog();
        }

        

        
    }
}