using System;

​

class Animal

{

    private string species;

​

    // Parameterized constructor in the base class

    public Animal(string species)

    {

        this.species = species;

        Console.WriteLine("Animal constructor invoked with species: " + species);

    }

​

    public void DisplaySpecies()

    {

        Console.WriteLine("Species: " + species);

    }

}

​

class Dog : Animal

{

    private string breed;

​

    // Constructor in the derived class

    public Dog(string species, string breed) : base(species) // Calling the base class constructor

    {

        this.breed = breed;

        Console.WriteLine("Dog constructor invoked with breed: " + breed);

    }

​

    public void DisplayBreed()

    {

        Console.WriteLine("Breed: " + breed);

    }

}

​

class Program

{

    static void Main(string[] args)

    {

        Dog labrador = new Dog("Canine", "Labrador");

        labrador.DisplaySpecies();  // Calling a method from the base class

        labrador.DisplayBreed();   // Calling a method from the derived class

    }

}

​