// @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 booksBefore = context.Books.ToList();

            FiddleHelper.WriteTable(booksBefore);

            var noOfRows = context.Database

                .ExecuteSqlCommand("UPDATE Books SET Title = 'Beginning C#' WHERE BookId = 1");

            context.SaveChanges();

        }

        using (var context = new BookStore())

        {

​

            var booksAfter = context.Books.ToList();

            FiddleHelper.WriteTable(booksAfter);

        }

    }

    public static void InsertData()

    {

        using (var context = new BookStore())

        {

            Author author1 = new Author()

            {

                Name = "Mark",

                Books = new List<Book>

                {

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

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

                }

            };

            Author author2 = new Author()

            {

                Name = "Andy",

                Books = new List<Book>

                {

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

                }

            };

            Author author3 = new Author()

            {

                Name = "Johny",

                Books = new List<Book>

                {

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

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

                }

            };

            context.Authors.Add(author1);

            context.Authors.Add(author2);

            context.Authors.Add(author3);

​

            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 Name { get; set; }

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

    }

}