Simple db4o database example written in c#

Person.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Person
    {
        public String firstName;
        public String lastName;
        public byte age;
        public String title;

        public Person(string firstName, string lastName, byte age)
        {
            this.firstName = firstName;
            this.lastName = lastName;
            this.age = age;
        }

        public Person(string firstName, string lastName, byte age, string title)
        {
            this.firstName = firstName;
            this.lastName = lastName;
            this.age = age;
            this.title = title;
        }

        public String ToString()
        {
            return title + " " + firstName + " " + lastName + ": " + age;
        }
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Db4objects.Db4o;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //open database file "person.data"
            using (IObjectContainer db = Db4oEmbedded.OpenFile("person.data"))
            {
                /* //declare some persons
                Person stefan = new Person("Max", "Mustermann", 17);
                Person pohl = new Person("Alfred", "Adams", 33);
                Person eckl = new Person("Florian", "Dietrich", 21);

                //store the persons in the database
                db.Store(stefan);
                db.Store(pohl);
                db.Store(eckl);

                db.Commit();
                //*/ 
                
                //fetch all Persons from the database
                IObjectSet result = db.QueryByExample(new Person(null, null, 0, null));

                //query through the results and print them out
                while (result.HasNext())
                {
                    Person next = (Person) result.Next();
                    Console.WriteLine(next.ToString());
                }

                Console.Read();

                //Close the database
                db.Close();
            }
        }
    }
}

Dear Dreistein, i was trying to use the code you publish, but i get an error in a Program class, "Db4oEmbedded" doesn't exist in current context. I found only db4o-7.2.msi which seems to be only for .NET 2.0 and i have 3.5 and 4.0 .NET on my PC and adding the Db4objects.Db4o doesn't resolve the error. Is there any way to use this DB. I tryed also to use it in VM as well, but with no luck.
Could you please help me?
Thanks a lot in advance!
Liudmila

helli Miliks i tried this code you can change ""Db4oEmbedded" by this "Db4oFactory" it works with me 👍

The sample data is a bit far fetched in my opinion:

One would never persist an age but the date of birth as we usually get older...