ASP.NET

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;

namespace Keycard
{
    [Serializable()]
    public class Keycard : ISerializable
    {
        protected string name;
        protected int mykey;

        public Keycard(string name, int mykey)
        {
            this.Name = name;
            this.Mykey = mykey;
        }

        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        public int Mykey
        {
            get { return mykey; }
            set { mykey = value; }
        }

        public void GetObjectData(SerializationInfo info, StreamingContext context)
        {

            info.AddValue("Name", name);
            info.AddValue("Keynumber", mykey);
  
        }
        public Keycard(SerializationInfo info, StreamingContext context)
        {
            Name = (string)info.GetValue("Name", typeof(string));
            Mykey = (int)info.GetValue("Keynumber", typeof(int));
        }

        public override string ToString()
        {
            return "Name: " + name + " ---- " + " Keynumber: " + mykey;
        }
    }
}

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Xml.Serialization;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace Keycard
{
    public partial class Index : System.Web.UI.Page
    {
        public void Main(string[] args)
        {
            Keycard d1 = new Keycard("John", 102030);

            Stream stream = File.Open("KeycardData.dat",
                FileMode.Create);

            BinaryFormatter bf = new BinaryFormatter();

            bf.Serialize(stream, d1);
            stream.Close();

            d1 = null;

            stream = File.Open("KeycardData.dat", FileMode.Open);

            bf = new BinaryFormatter();

            d1 = (Keycard)bf.Deserialize(stream);
            stream.Close();
            Console.WriteLine(d1.ToString());

            XmlSerializer serializer = new XmlSerializer(typeof(Keycard));

            using(TextWriter tw = new StreamWriter(@"L\C#\keycards.xml"))
            {
                serializer.Serialize(tw, d1);
            }

            d1 = null;

            XmlSerializer deserializer = new XmlSerializer(typeof(Keycard));
            TextReader reader = new StreamReader(@"L\C#\keycards.xml");
            object obj = deserializer.Deserialize(reader);
            d1 = (Keycard)obj;
            reader.Close();
            Console.WriteLine(d1.ToString());
        }

    }
}

using OdeToFood.Data

using OdeToFood.Core

using OdeToFood.Data

public class Person
 {
 public Person(string firstName, string lastName, int age, string email)
 {
 FirstName = firstName;
 LastName = lastName;
 Age = age;
 Email = email;
 }
 public string FirstName { get; set; }
 public string LastName { get; set; }
 public int Age { get; set; }
 public string Email { get; }
 public virtual bool ChangeEmail(string email)
 {
 Email = email;
 return true;
 }
 public override string ToString()
 {
 return $"Name: {FirstName} {LastName}, Age: {Age}, E-mail: {Email}";
 }
 }

public class Driver : Person
 {
 private string v1;
 private string v2;
 private string v3;
 private string v4;
 private string v5;
 public Driver(string firstName, string lastName, int age, string email, int
licenceNumber)
 : base(firstName, lastName, age, email)
 {
 LicenceNumber = licenceNumber;
 }
 public Driver(string v1, string v2, string v3, string v4, string v5)
 {
 this.v1 = v1;
 this.v2 = v2;
 this.v3 = v3;
 this.v4 = v4;
 this.v5 = v5;
 }
 public int LicenceNumber { get; set; }
 public override string ToString()
 {
 return $"Role: Traindriver, LicenceNumber: {LicenceNumber}, " + base.ToString();
 }
 }
 public class Admin : Person
 {
 public Admin(string firstName, string lastName, int age, string email)
 : base(firstName, lastName, age, email)
 {
 }
 public override bool ChangeEmail(string email)
 {
 if (!email.EndsWith("@pig.dk", StringComparison.InvariantCultureIgnoreCase))
 return false;
 return base.ChangeEmail(email);
 }
 public override string ToString()
 {
 return $"Role: Admin, " + base.ToString();
 }
 }
}

namespace Pig
{
 public partial class Index : System.Web.UI.Page
 {
 public object ListBoxResults { get; private set; }
 public object DriverListBox { get; private set; }
 protected void Page_Load(object sender, EventArgs e)
 {
 Driver d1 = new Driver("Hans", "Christensen", 32, "hans@pig.dk", 123456);
 Driver d2 = new Driver("Peter", "Jensen", 40, "peter@mail.dk", 123456);
 Admin a1 = new Admin("Lene", "Maarud", 55, "lene@pig.dk");
 ArrayList person = new ArrayList();
 ListBoxResults.Items.Add(d1.ToString());
 ListBoxResults.Items.Add(d2.ToString());
 ListBoxResults.Items.Add(a1.ToString());
 }
 }
}

<pre><%@ Page Language="C#" AutoEventWireup="true" CodeBehind="index.aspx.cs"
Inherits="ThePig.index" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
 <title></title>
</head>
<body>
 <form id="form1" runat="server">
 <div>
 <asp:ListBox ID="ListBoxResults" runat="server" Height="800px"
Width="600px"></asp:ListBox>
 </div>
 </form>
</body>
</html>