using System;

using System.Collections.Generic;

using System.Linq;

​

class Pet

{

    public string Name { get; set; }

    public int Age { get; set; }

}

​

​

​

​

public class Program

{

    public static void Main()

    {

        Pet[] cats = GetCats();

        Pet[] dogs = GetDogs();

        IEnumerable<string> catNames = cats.Select(cat => cat.Name);

        foreach(string name in catNames)

            Console.WriteLine(name);

        IEnumerable<int> catAges = cats.Select(cat => cat.Age);

        foreach(int age in catAges)

            Console.WriteLine(age);

        IEnumerable<string> dogNames = dogs.Select(dog => dog.Name);

        foreach(string name in dogNames)

            Console.WriteLine(name);

        //Concatenates them like so: all dognames first and then all cat names

        //Each name gets a separate line

        IEnumerable<string> combinedNames = dogs.Select(dog => dog.Name).Concat(cats.Select(cat => cat.Name));

        List<string> combinedNamesList = combinedNames.ToList();

        Console.WriteLine();

        Console.WriteLine(combinedNamesList[5]);

    }

    static Pet[] GetCats()

    {

        Pet[] cats = {

            new Pet { Name="Barley", Age=8 },

            new Pet { Name="Boots", Age=4 },

            new Pet { Name="Whiskers", Age=1 } 

        };

        return cats;

    }

    static Pet[] GetDogs()

    {

        Pet[] dogs = { 

            new Pet { Name="Bounder", Age=3 },

            new Pet { Name="Snoopy", Age=14 },

            new Pet { Name="Fido", Age=9 } 

        };

        return dogs;

    }

}