Code for URL Encoder-Decoder!!!

Question

This is the code to Encode and Decode URL...Any suggestions on this are welcome...
public class UrlEncoderDecoder
public UrlEncoderDecoder()
// TODO: Add constructor logic here
// http://www.infysolutions.com
public static string TamperProofStringEncode(string value, string key)
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
return Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(value)) + '-' + Convert.ToBase64String(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetBytes(value)));
public static string TamperProofStringDecode(string value, string key)
string dataValue = "";
string calcHash = "";
string storedHash = "";
System.Security.Cryptography.MACTripleDES mac3des = new System.Security.Cryptography.MACTripleDES();
System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
mac3des.Key = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(key));
// http://www.infysolutions.com
try
dataValue = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[0]));
storedHash = System.Text.Encoding.UTF8.GetString(Convert.FromBase64String(value.Split('-')[1]));
calcHash = System.Text.Encoding.UTF8.GetString(mac3des.ComputeHash(System.Text.Encoding.UTF8.GetByte s(dataValue)));
if (storedHash != calcHash)
throw new ArgumentException("Hash value does not match");
catch
throw new ArgumentException("Invalid TamperProofString");
return dataValue;

Answer 1

Ritu,
Split the webpage into two frames.
Frame1: Dropdown that you will dynamically populate. This will have to be coded using http://help.sap.com/saphelp_nw04/helpdata/en/09/9c0e41a346ef6fe10000000a1550b0/content.htm.
Next insert java script into your page so that when one of these links is selected, specifically the onChange event, the other frame gets refreshed with the webpage that you would like to have. This page gives a good example of onChange.
http://docs.sun.com/source/816-6408-10/checkbox.htm
Best.
Sumit.