C# MD5加密调用

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.Authentication;
using System.Security.Cryptography;

namespace WindowsFormsApplication1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        //¼ÓÃÜ·½·¨
        public String EncryptCode(String message)     
        {           
            Byte[] clearBytes = new UnicodeEncoding().GetBytes(message);       
            Byte[] hashedBytes = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes);     
            String tt = BitConverter.ToString(hashedBytes).Replace("-", "");      
             MessageBox.Show(tt);       
            return tt;     
        }