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using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

namespace Secrituy
{
   
   

    public class Secure
    {
        private static byte[] DESKey = new byte[]{11,23,93,102,72,41,18,12};
        private static byte[] DESIV = new byte[] { 75, 158, 46, 97, 78, 57, 17, 36 };

        public static string Encode(string Encode_String)
        {
            DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
            MemoryStream objMemoryStream = new MemoryStream();
            CryptoStream objCryptoStream = new CryptoStream(objMemoryStream, objDES.CreateEncryptor(DESKey, DESIV), CryptoStreamMode.Write);
            StreamWriter objStreamWriter = new StreamWriter(objCryptoStream);
            objStreamWriter.Write(Encode_String);
            objStreamWriter.Flush();
            objCryptoStream.FlushFinalBlock();
            objMemoryStream.Flush();
            return Convert.ToBase64String(objMemoryStream.GetBuffer(), 0, (int)objMemoryStream.Length);
        }

        public static string Decode(string Encode_String)
        {
            DESCryptoServiceProvider objDES = new DESCryptoServiceProvider();
            byte[] input = Convert.FromBase64String(Encode_String);
            MemoryStream objMemoryStream = new MemoryStream(input);
            CryptoStream objCryptoStream = new CryptoStream(objMemoryStream, objDES.CreateDecryptor(DESKey, DESIV), CryptoStreamMode.Read);
            StreamReader objStreamReader = new StreamReader(objCryptoStream);
            return objStreamReader.ReadToEnd();
        }
    }
}

<SCRIPT language=JavaScript >
window.onbeforeunload = function ()
{
    // . . . 
    event.returnValue = "You will lose any unsaved content";
    // . . .   
}
</script>