// @nuget: EntityFramework

​

using System;

using System.Data.Entity;

using System.Linq;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations.Schema;

using System.ComponentModel.DataAnnotations;

​

public class Program

{

    public static void Main()

    {

        InsertData();

        using (var context = new BookStore())

        {

            var authors = context.Authors

                .Where(a => a.Books.Any()).ToList();

            DisplayData(authors);

        }   

    }

    public static void DisplayData(List<Author> list)

    {

        foreach(var author in list)

        {

            Console.WriteLine(author.FirstName + " " + author.FirstName);

            foreach(var book in author.Books)

            {

                Console.WriteLine("\t" + book.Title);

            }

        }

    }

    public static void InsertData()

    {

        using (var context = new BookStore())

        {

            var Authors = new List<Author>

            {

                new Author() {FirstName = "Mark", LastName = "Cuban"},

                new Author() {FirstName = "Andy", LastName = "Holloway"},

                new Author() {FirstName = "Johny", LastName = "bravo"}

            };

            var Books = new List<Book>

            {

                new Book() { Title = "Fundamentals of Computer Programming with C#", AuthorId = 1},

                new Book() { Title = "Java: A Beginner's Guide", AuthorId = 1},

                new Book() { Title = "SQL: The Ultimate Beginners Guide", AuthorId = 2},

                new Book() { Title = "Learn VB.NET", AuthorId = 2},

                new Book() { Title = "C# Fundamentals for Absolute Beginners", AuthorId = 2}

            };

            context.Authors.AddRange(Authors);

            context.Books.AddRange(Books);

            context.SaveChanges();

        }

    }

    public class BookStore : DbContext

    {

        public BookStore() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

        }

​

        public DbSet<Author> Authors { get; set; }

        public DbSet<Book> Books { get; set; }

    }

​

    public class Book

    {

        public int BookId { get; set; }

        public string Title { get; set; }

        public int AuthorId { get; set; }

        [ForeignKey("AuthorId")]

        public Author Author { get; set; }

    }

​

​

    public class Author

    {

        public int AuthorId { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public virtual ICollection<Book> Books { get; set; }

    }

}