using System;

using System.Collections.Generic;

​

//use class modifier

    class Dog : Pet

    {

        //bad naming; do not use underline '_' in parameters 

        public Dog(string _name, string _breed) :

            base(_name, _breed)

        { }

​

        public override void Introduce()

        {

            //do not invoke base

            base.Introduce();

            Console.WriteLine("dog.");

        }

    }

​

    //use class modifier

    class Cat : Pet

    {

​

        //bad naming; do not use underline '_' in parameters 

        public Cat(string _name, string _breed) :

            base(_name, _breed)

        { }

​

        public override void Introduce()

        {

            //do not invoke base

            //should implement Introduce with Console.WriteLine(....);, do not split using of console writeline in such situation

            base.Introduce();

            Console.WriteLine("cat.");

        }

    }

​

    public abstract class Pet

    {

        protected string Name { get; set; }

        protected string Breed { get; set; }

​

​

        //can be protected

        //parameters naming

        public Pet(string _name, string _breed)

        {

            Name = _name;

            Breed = _breed;

        }

​

        //should be abstract (not virtual)

        public virtual void Introduce()

        {

            Console.Write(string.Format("I'm {0} of {1}. I'm a ", Name, Breed));

        }

    }

​

    //class modifier

    class PetShop

    {

        //naming field

        private List<Pet> petCollection = new List<Pet>();

​

        public void AddPet(Pet pet)

        {

            petCollection.Add(pet);

        }

        public void IntroduceAll()

        {

            petCollection.ForEach(p => p.Introduce());

        }

    }

​

​

    public class Program

    {

        public static void Main()

        {

            //using vars when result is clear

            Cat cat1 = new Cat("name1", "breed1");

            Cat cat2 = new Cat("name2", "breed2");

            Cat cat3 = new Cat("name3", "breed1");

            Cat cat4 = new Cat("name4", "breed2");

​

            Dog dog1 = new Dog("name1", "breed1");

            Dog dog2 = new Dog("name2", "breed2");

            Dog dog3 = new Dog("name3", "breed1");

            Dog dog4 = new Dog("name4", "breed2");

​

            //naming

            PetShop newPetshop = new PetShop();

            newPetshop.AddPet(cat1);

            newPetshop.AddPet(cat2);

            newPetshop.AddPet(cat3);

            newPetshop.AddPet(cat4);

​

            newPetshop.AddPet(dog1);

            newPetshop.AddPet(dog2);

            newPetshop.AddPet(dog3);

            newPetshop.AddPet(dog4);

​

            newPetshop.IntroduceAll();

​

            Console.ReadKey();

        }

    }