简单继承问题

我有几个错误说:

“名称'title'在其当前上下文中不存在” “当前上下文中不存在'author'名称” “当前上下文中不存在'genre'名称” “名称'pages'在其当前上下文中不存在”

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

namespace ReadingMaterials
{
    class Program
    {
        static void Main(string[] args)
        {

        }

        public class Basic
        {
            protected string Title;
            protected string Author;
            protected string Genre;
            protected int Pages;

            public Basic(string title, string author, string genre, int pages)
            {
                Title = title;
                Author = author;
                Pages = pages;
                Genre = genre;
            }

            public int PageCount
            {
                get { return Pages; }
                set { Pages = value; }
            }

            public string GenreType
            {
                get { return Genre; }
                set { Genre = value; }
            }

            public string AuthorType
            {
                get { return Author; }
                set { Author = value; }
            }

            public string TitleName
            {
                get { return Title; }
                set { Title = value; }
            }
        }

        public class Book : Basic
        {
            protected bool Hardcover;

            public Book(bool hardcover) 
                : base(title, author, genre, pages)
            {
                Hardcover = hardcover;
            }

            public bool IsHardcover
            {
                get { return Hardcover; }
                set { Hardcover = value; }
            }
        }


    }
}

我错过了什么?提前谢谢。