JSP to .Net

I have a relatively simple piece of JSP code that I need to convert to .Net (don't mind if it is VB or C#).

Anyone have any ideas?

<%@ page import="java.util.*, 
	java.text.*, 
	java.io.*, 
	javax.servlet.*, 
	javax.crypto.Cipher,
	javax.crypto.SecretKey,
	javax.crypto.spec.SecretKeySpec, 
	java.net.URLEncoder, 
	java.security.spec.AlgorithmParameterSpec,
	java.security.GeneralSecurityException,
	java.security.NoSuchAlgorithmException,
	org.apache.commons.codec.binary.Base64,
	org.apache.commons.codec.binary.Hex,
	org.apache.commons.codec.BinaryEncoder"%>

<%
// remove the domain name from the user string
String s = request.getParameter("id");
String username = s.substring(s.indexOf("\\")+1, s.length()); 

// decode the base64 encoded secret key
//String b64EncodedSecretKey = "y2K0SPm1WO0iOm/DMNnJcpF1XRL5LknC6i9y5R0J8HM=";
String b64EncodedSecretKey = "+od47ejGF/G94ultfN8QYg==";
byte[] secretKeyBytes = b64EncodedSecretKey.getBytes("UTF-8");
byte[] keyData = Base64.decodeBase64(secretKeyBytes);

// create a secret key instance
String encryptionAlgorithm = "AES";
SecretKey secretKey = new SecretKeySpec(keyData, encryptionAlgorithm);

// create cipher. note that because no mode/padding is specified in the
// encryption transformation below, the default mode and padding of "ECB"
// and "PKCS5Padding", respectively, will be used.
String encryptionTransformation = "AES";
Cipher cipher = Cipher.getInstance(encryptionTransformation);
cipher.init(Cipher.ENCRYPT_MODE, secretKey, (AlgorithmParameterSpec)null);

// get ticket expiration date
Calendar cal = Calendar.getInstance();
cal.setTime(new Date());
cal.add(Calendar.MINUTE, 5); // expire 5 minutes from now
Date expireDate = cal.getTime();

// format date
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
String iso8601Date = df.format(expireDate);

// create ticket payload.
StringBuffer buff = new StringBuffer();
buff.append(username); // login key
buff.append('|');
buff.append(iso8601Date); // ISO-8601 formatted UTC date
String ticketPayload = buff.toString();

// encrypt ticket
byte[] encryptedTicket = cipher.doFinal(ticketPayload.getBytes());

// base64 encode the encrypted ticket
byte[] rawBase64Bytes = Base64.encodeBase64(encryptedTicket , false);
String b64EncodedTicket = new String(rawBase64Bytes, "UTF-8");

// url encode the base64 encoded ticket. the resulting url encoded ticket
// should be used as the value for the 'Ticket' query parameter
String urlEncodedTicket = URLEncoder.encode(b64EncodedTicket, "UTF-8"); 

response.sendRedirect("https://TargetDomain.com/security/security_check?orgKey=H15S2AC40X&Ticket=" + urlEncodedTicket );
%>

Code (markup):