Entity Framework 6 Code First Tutorial

Entity Framework 6 Code First Tutorial , enjoy
public class User
{
    [Key]
    public int Id { get; set; }
    public string Name { get; set; }
    public List<Article> Articles { get; set; }
}

public class Article
{
    [Key]
    public int Id { get; set; }
    public int ArticleId { get; set; }

    [ForeignKey("User")]
    public int UserIdFK { get; set; }
    public virtual User User { get; set; }
    public int NumOfClicks { get; set; }
}


public class MyDb : DbContext
{ 
    public MyDb()
        : base("name=MyDb")
    {
    }
    public virtual DbSet<User> Users { get; set; }
    public virtual DbSet<Article> Articles { get; set; }
}     







    public static void AddUser()
    {
        using (var db = GetDataBase())
        {
            db.Users.Add(new User() { Name = "Coding is Simple" });
            db.SaveChanges();
        }
    }
    public static User GetUser(int userId)
    {
        using (var db = GetDataBase())
        {
            return db.Users.Where(x => x.Id == userId).FirstOrDefault();
        }
    }

    public static void UpdateUser1(int userId)
    {
        using (var db = GetDataBase())
        {
            var u = db.Users.Where(x => x.Id == userId).FirstOrDefault();
            u.Name = "Wow";
            db.SaveChanges();
        }
    }

    public static void UpdateUser2(int userId)
    {
        using (var db = GetDataBase())
        {
            User a = new User() { Id = userId, Name = "Wow" };
            db.Users.Attach(a);
            db.Entry(a).Property(c => c.Name).IsModified = true;
            db.SaveChanges();
        }
    }


    public static void DeleteUser(int userId)
    {
        using (var db = GetDataBase())
        {
            var articles = db.Articles.Where(x => x.UserIdFK == userId).ToList();

            for (int i = 0; i < articles.Count; i++)
            {
                db.Articles.Remove(articles[i]);
            }

            db.Users.Remove(GetUser(userId));
            db.SaveChanges();
        }
    }

    public static MyDb GetDataBase()
    {
        return new MyDb();
    }