Encrypt/decrypt string data stored within sql server 2008

private void button1_Click(object sender, System.EventArgs e) {
    byte[] cipherText = Encoding.Unicode.GetBytes(textBox1.Text.PadRight(textBox1.Text.Length + 7 - ((textBox1.Text.Length + 7) % 8), ' '));
    byte[] cipherTextOut = new byte[cipherText.Length];
    byte[] cipherText16 = new byte[16];
    byte[] cipherTextOut16 = new byte[16];
    byte[] passwordBytes = Encoding.Unicode.GetBytes(textBox4.Text.PadRight(8, ' '));
    AesLib.Aes a = new Aes(radioButton1.Checked ? Aes.KeySize.Bits128 : radioButton2.Checked ? Aes.KeySize.Bits192 : Aes.KeySize.Bits256, passwordBytes);
    for (int i = 0; i < cipherText.Length; i += 16) {
        System.Buffer.BlockCopy(cipherText, i, cipherText16, 0, 16);
        a.Cipher(cipherText16, cipherTextOut16);
        System.Buffer.BlockCopy(cipherTextOut16, 0, cipherTextOut, i, 16);
    }
    textBox2.Text = Convert.ToBase64String(cipherTextOut);
}

private void button2_Click(object sender, System.EventArgs e) {
    byte[] cipherText = Convert.FromBase64String(textBox2.Text);
    byte[] decipheredText = new byte[cipherText.Length]; // should always be a multiple of 16
    System.Diagnostics.Debug.Print(cipherText.Length.ToString());
    byte[] cipherText16 = new byte[16];
    byte[] decipheredText16 = new byte[16];
    byte[] passwordBytes = Encoding.Unicode.GetBytes(textBox4.Text.PadRight(8, ' '));
    AesLib.Aes a = new Aes(radioButton1.Checked ? Aes.KeySize.Bits128 : radioButton2.Checked ? Aes.KeySize.Bits192 : Aes.KeySize.Bits256, passwordBytes);
    for (int i = 0; i < cipherText.Length; i += 16) {
        System.Buffer.BlockCopy(cipherText, i, cipherText16, 0, 16);
        a.InvCipher(cipherText16, decipheredText16);
        System.Buffer.BlockCopy(decipheredText16, 0, decipheredText, i, 16);
    }
    textBox3.Text = Encoding.Unicode.GetString(decipheredText).TrimEnd();
}

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