Book.cs

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

namespace DoFactory.GangOfFour.Decorator.RealWorld
{
    /// <summary>
    /// The 'ConcreteComponent' class
    /// </summary>
    public class Book : LibraryItem
    {
        private string _author;
        private string _title;

        // Constructor
        public Book(string author, string title, int numCopies)
        {
            _author = author;
            _title = title;
            NumCopies = numCopies;
        }

        public override void Display()
        {
            Console.WriteLine("\nBook ------ ");
            Console.WriteLine(" Author: {0}", _author);
            Console.WriteLine(" Title: {0}", _title);
            Console.WriteLine(" # Copies: {0}", NumCopies);
        }
    }
}