turn-off-lazy-loading.cs

 public class OrderingDbContext : DbContext
    {
        public DbSet<Order> Order { get; set; }
        public DbSet<LineItem> LineItem { get; set; }

        public OrderingDbContext(DbContextOptions<OrderingDbContext> options) : base(options)
        {
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseLazyLoadingProxies();
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
        }
    }