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 private void button1_Click(object sender, EventArgs e)
        {
            System.Security.Cryptography.RijndaelManaged r = (System.Security.Cryptography.RijndaelManaged)System.Security.Cryptography.RijndaelManaged.Create();
            r.GenerateIV();
            r.GenerateKey();
            string Key = Convert.ToBase64String(r.Key);
            string IV = Convert.ToBase64String(r.IV);
            MessageBox.Show(Key); MessageBox.Show(IV);
            byte[] encryptbyte = CryptoTransform(r.CreateEncryptor(Convert.FromBase64String(Key), Convert.FromBase64String(IV)), Encoding.UTF8.GetBytes("http://www.izoq.net/"));
            string encryptkey = Convert.ToBase64String(encryptbyte);

            byte[] byteDecrypted = CryptoTransform(r.CreateDecryptor(Convert.FromBase64String(Key), Convert.FromBase64String(IV)), Convert.FromBase64String(encryptkey));
            string decryptstring = Encoding.UTF8.GetString(byteDecrypted);

            MessageBox.Show(encryptkey);
            MessageBox.Show(decryptstring);
            MessageBox.Show("http://www.dc9.cn");
        }

        private byte[] CryptoTransform(System.Security.Cryptography.ICryptoTransform cryptoTransform, byte[] bSrcs)
        {
          
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(ms, cryptoTransform, System.Security.Cryptography.CryptoStreamMode.Write);
            try
            {
                cs.Write(bSrcs, 0, bSrcs.Length);
                cs.FlushFinalBlock();
                ms.Position = 0;
            }
            catch (System.Security.Cryptography.CryptographicException)
            {
                
            }
            finally
            {
                ms.Close();
                cs.Close();
            }
//www.dc9.cn
            return ms.ToArray();
        }