C#コミュの暗号化（GUIにしてもうたスマソ。。）　無駄な箇所を教えていただけると嬉しい

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;


namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private byte[] DesKey;
private byte[] DesIV;


private void button1_Click(object sender, EventArgs e)
{
TripleDESCryptoServiceProvider TDES = new TripleDESCryptoServiceProvider();
DesKey = TDES.Key;
DesIV = TDES.IV;

// string to byte
byte[] source = Encoding.Unicode.GetBytes(textBox1.Text);　　　

// select Triple DES service provider
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();　　

// make to write stream
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(DesKey, DesIV),
CryptoStreamMode.Write);

//write data Encrypte
cs.Write(source, 0, source.Length);
cs.Close();

//get to byte from string
byte[] destination = ms.ToArray();
ms.Close();

//show this
textBox2.Text = Encoding.Unicode.GetString(destination);

textBox4.Text = Encoding.Unicode.GetString(DesKey);

textBox5.Text = Encoding.Unicode.GetString(DesIV);

}

private void button2_Click(object sender, EventArgs e)
{

byte[] source = Encoding.Unicode.GetBytes(textBox2.Text);


TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();

DesKey = Encoding.Unicode.GetBytes(textBox6.Text);
DesIV = Encoding.Unicode.GetBytes(textBox7.Text);


MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(DesKey, DesIV),
CryptoStreamMode.Write);


cs.Write(source, 0, source.Length);
cs.Close();


byte[] destination = ms.ToArray();
ms.Close();


textBox3.Text = Encoding.Unicode.GetString(destination);
}
}
}