Some Simple Samples

I have been playing with the new .NET 3.5 framework.  Several people asked to see that samples that I was writing just to try stuff out so I decided to make a little post.  This is just some simple code I wrote to teach myself the basics so its nothing special.  I should have some LINQ samples up later. If you have any questions feel free to ask.

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

namespace Sample
{
    class Program
    {
        static void Main(string[] args)
        {
            //create some sample objects
            var p1 = new Person { firstName = "Matthew", lastName = "Osborn" };
            var p2 = new Person { firstName = "Mark", lastName = "Osborn" };
            var p3 = new Person { firstName = "Karen", lastName = "Osborn" };
            var d1 = new Dog { Breed = "Shetland Sheep Dog", Name = "Baxtor", Owner="Matthew" };
            var d2 = new Dog { Breed = "Shetland Sheep Dog", Name = "Rip", Owner = "Matthew" };
            //add these objects to two different collections
            var people = new List<Person>();
            people.Add(p1);
            people.Add(p2);
            people.Add(p3);
            var dogs = new List<Dog>();
            dogs.Add(d1);
            dogs.Add(d2);
            //join people and dogs on owner first name
            var test =
                people.Join(dogs, p => p.firstName, d => d.Owner, (p,d) => new { p, d });
            //print out results
            foreach (object o in test)
                o.print();
        }
    }

    public class Person
    {
        public string firstName { get; set; }
        public string lastName { get; set; }

        public override string ToString()
        {
            return firstName + " " + lastName;
        }
    }

    public class Dog
    {
        public string Name { get; set; }
        public string Breed { get; set; }
        //referances a persons first name
        public string Owner { get; set; }

        public override string ToString()
        {
            return Name + " is a " + Breed;
        }
    }

    /// <summary>
    /// Static class to hold all my extension methods
    /// </summary>
    public static class Extensions
    {
        //generic extension method to print items to the console
        //This can easily be used for debuging
        public static void print<T>(this T obj)
        {
            Console.WriteLine(obj.ToString());
        }
    }
}