using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Text;
using?System.Windows.Forms;

//required?for?xmlDocument
using?System.xml;
//required?for?performing?RSA?encryption
using?System.Security.Cryptography;
//required?to?use?Encryptedxml?object?requires?the?System.Security?assembly?to?be?referenced
using?System.Security.Cryptography.xml;

/*
?*?
?*?
?*?
?*?
?*?
?*?
?*?
?*/?

namespace?xmlEncryption
{
????///?

????///?
????///?

????public?partial?class?Form1?:?Form
????{

????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}


????????///?

????????///?
????????///?RSA?asymmetric?algorithim?used?to?encrypt?the?session?key?key?is?generated?during?the?encryption?process
????????///?in?this?example?a?key?is?generated?however?in?an?actual?application?you?will?need?to?load?and?save?the?
????????///?keys?as?appropriate
????????///?
????????///?

????????RSACryptoServiceProvider?rsa;

????????///?

????????///?
????????///?Loads?the?xml?into?an?xml?document?and?encrypts?the?full?document?from?the?root
????????///?it?does?not?cover?selecting?and?encrypting?individual?nodes?in?the?document
????????///?however?the?place?where?this?code?would?be?placed?is?highlighted.
????????///?
????????///?It?also?doesn‘t?cover?loading?or?saving?the?asymmetric?keys?
????????///?the?key?is?created?in?the?encrypt?method?and?because?of?the?way?the?application?works?the?same?key?is?used?to?decrypt
????????///?a?new?key?is?generated?every?time?an?encyption?is?ran
????????///?
????????///?

????????///?
????????///?
????????private?void?encryptToolStripMenuItem_Click（object?sender?EventArgs?e）
????????{
????????????//check?there?is?xml?to?encrypt
????????????if?（string.IsNullOrEmpty（this.txtxml.Text）?==?false）
????????????{
????????????????try
????????????????{
????????????????????//1.?load?the?xml?in?to?a?document?full?document?will?be?encrypted
????????????????????xmlDocument?xmlDoc?=?new?xmlDocument（）;
????????????????????xmlDoc.Loadxml（this.txtxml.Text）;

????????????????????//2.?Generate?an?asymmetric?key?（RSA?is?used）?rsa?object?needs?to?have?class?level
????????????????????//as?it‘s?used?to?decrypt?the?encrypted?xml?later?in?the?class
????????????????????rsa?=?new?RSACryptoServiceProvider（）;
????????????????????
????????????????????//3.?Select?the?element?that?will?be?encrypted?
????????????????????xmlElement?xmlElemt;
????????????????????xmlElemt?=?xmlDoc.DocumentElement;??//at?this?point?you?could?use?SelectSingleNode
????????????????????//to?select?a?specific?node?to?encrypt

????????????????????//4.?Encrypt?the?element?in?the?document?using?the?Encryptedxml?object
????????????????????//the?Encryptedxml?object?is?found?in?the?System.Security.Cryptography.xml?namespace
???