Changing hash back to text

protected string MD5Hash(string input)
{
    StringBuilder stringBuilder = new StringBuilder();
    MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
    byte[] bytes = md5.ComputeHash(new UTF8Encoding().GetBytes(input));
    for (int i = 0; i < bytes.Length; i++)
    {
        stringBuilder.Append(bytes[i].ToString("x2"));
    }
    return stringBuilder.ToString();

}