program to encode and decode a given text in vs2010

private string EncodeString(int s)

    {

        byte[] b = System.Text.Encoding.Default.GetBytes(s.ToString());

        return Convert.ToBase64String(b, 0, b.Length);

    }

    private string DecodeString(string s)

    {

        byte[] b = Convert.FromBase64String(s);

        return System.Text.Encoding.Default.GetString(b);

    }

Regards,
Susan