EncodeQuery.cs-----------------using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Security.Cryptography;using System.IO;using System.Text;namespace QueryString{public class EncodeQuery{private static byte[] key = { };private static byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };private static string EncryptionKey = "!#853g`de";public string Encrypt(string Input){try{key = System.Text.Encoding.UTF8.GetBytes(EncryptionKey.Substring(0, 8));DESCryptoServiceProvider des = new DESCryptoServiceProvider();Byte[] inputByteArray = Encoding.UTF8.GetBytes(Input);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return Convert.ToBase64String(ms.ToArray());}catch (Exception ex){return "";}}}}DecodeQuery.cs------------------using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Security.Cryptography;using System.IO;using System.Text;namespace QueryString{public class DecodeQuery{private static byte[] key = { };private static byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };private static string EncryptionKey = "!#853g`de";public string Decrypt(string Input){Byte[] inputByteArray = new Byte[Input.Length];try{key = System.Text.Encoding.UTF8.GetBytes(EncryptionKey.Substring(0, 8));DESCryptoServiceProvider des = new DESCryptoServiceProvider();inputByteArray = Convert.FromBase64String(Input);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();Encoding encoding = Encoding.UTF8;return encoding.GetString(ms.ToArray());}catch (Exception ex){return "";}}}}
Default.aspx--------------<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="QueryString._Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"><title></title></head><body><form id="form1" runat="server"><div style="height: 138px"><asp:Button ID="Button1" runat="server" onclick="Button1_Click"Text="Redirect" /></div></form></body></html>Default.aspx.cs---------------------using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace QueryString{public partial class _Default : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){}protected void Button1_Click(object sender, EventArgs e){EncodeQuery eq = new EncodeQuery();Response.Redirect("WebForm1.aspx?" + "Name=" + eq.Encrypt("muruga") +"&LastName=" + eq.Encrypt("S"));}}}WebForm1.aspx----------------<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="QueryString.WebForm1" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"><title></title></head><body><form id="form1" runat="server"><div></div></form></body></html>WebForm1.aspx.cs-------------------using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace QueryString{public partial class WebForm1 : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){DecodeQuery eq = new DecodeQuery();string str1 = eq.Decrypt(Request.QueryString["Name"]);string str2 = eq.Decrypt(Request.QueryString["LastName"]);Response.Write(str1+" ");Response.Write(str2);}}}
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