// @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()

    {

        using (var context = new BookStore())

        {   

            Book book = new Book(){Title = "My Book"};

            context.Books.Add(book);

​

            context.SaveChanges();

            var updatedBook = context.Books.FirstOrDefault();

            updatedBook.Title = "My Book updated title";

            context.Database.Log = Console.Write; 

            context.SaveChanges();

        }

    }

    public class BookStore : DbContext

    {

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

        {

        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)

        {

            modelBuilder.Entity<Book>()

                .Property(b => b.Title).IsConcurrencyToken();

        }

​

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

    }

    public class Book

    {

        public int BookId { get; set; }

​

        public string Title { get; set; }

    }

}