Get Dot net specific code for following java program

I have following code which generate key.

DocumentBuilder documentBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder();

Document document = documentBuilder.newDocument();

Element rootElement = document.createElement("License");

document.appendChild(rootElement);

Element computerElement = document.createElement("KeyRequest");

computerElement.appendChild(document.createTextNode(keyRequestTextField.getText()));

rootElement.appendChild(computerElement);

Element expirationDateElement = document.createElement("ExpirationDate");

expirationDateElement.appendChild(document.createTextNode(sdf.format((Date) expirationDateSpinner.getValue())));

rootElement.appendChild(expirationDateElement);

// Get string from xml

StringWriter writer = new StringWriter();

TransformerFactory.newInstance().newTransformer().transform(new DOMSource(document), new StreamResult(writer));

String licenseKeySource = writer.toString();

// Encrypt

// licenseKeyTextArea.setText(licenseKeySource);

Cipher cipher = Cipher.getInstance("AES");

String encryptionKey = keyRequestTextField.getText().replaceAll("-", "");

Key key = new SecretKeySpec(encryptionKey.getBytes(), "AES");

cipher.init(Cipher.ENCRYPT_MODE, key);

byte[] data = cipher.doFinal(licenseKeySource.getBytes(Charset.forName("UTF-8")));

// Convert to dictionary

int[] bytes;

if ( (data.length * 8) % 6 == 0) {

bytes = new int[data.length];

} else {

bytes = new int[data.length+1];

}

for (int i = 0; i < data.length; i++) {

bytes[i] = data[i] + 128;

System.out.println(bytes[i]);

}

char[] symbols = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/".toCharArray();

//StringBuilder builder = new StringBuilder("#$%");

StringBuilder builder = new StringBuilder();

System.out.println("Length = " + bytes.length);

for (int index = 0; index < bytes.length * 8 / 6; index++) {

int position = (index * 6) / 8;

int offset = (index * 6) % 8;

int result = 0;

if (offset == 0) {

int b = bytes[position];

result = b >> 2;

} else if (offset == 2) {

int b = bytes[position];

result = b & 63;

} else if (offset == 4) {

int c1 = (bytes[position] << 2) & 63;

int c2 = bytes[position + 1] >> 6;

result = c1 | c2;

} else if (offset == 6) {

int c1 = (bytes[position] << 4) & 63;

int c2 = (bytes[position + 1] >> 4) & 15;

result = c1 | c2;

}

builder.append(symbols[result]);

}

//builder.append("%$#");

licenseKeyTextArea.setText(builder.toString());