Hi im using C# and im making a encryptor/decryptor and my decrypt button doesnt work it starts up fine but when I click the button nothing seems to happen help

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Security.Cryptography;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        byte[] encrypted;
        private void button1_Click(object sender, EventArgs e)
        {
            TripleDESCryptoServiceProvider triple = new TripleDESCryptoServiceProvider();
            UTF8Encoding u = new UTF8Encoding();
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            triple.Key = md5.ComputeHash(u.GetBytes(textBox1.Text));
            triple.Mode = CipherMode.ECB;
            triple.Padding = PaddingMode.PKCS7;
            ICryptoTransform trans = triple.CreateEncryptor();
            encrypted = trans.TransformFinalBlock(u.GetBytes(textBox2.Text), 0, u.GetBytes(textBox2.Text).Length);
            textBox3.Text = BitConverter.ToString(encrypted);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            TripleDESCryptoServiceProvider triple = new TripleDESCryptoServiceProvider();
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            UTF8Encoding u = new UTF8Encoding();
            triple.Key = md5.ComputeHash(u.GetBytes(textBox1.Text));
            triple.Mode = CipherMode.ECB;
            triple.Padding = PaddingMode.PKCS7;
            ICryptoTransform trans = triple.CreateDecryptor();
            textBox5.Text = u.GetString(trans.TransformFinalBlock(encrypted, 0, encrypted.Length));
        }
    }
}