BooksSample.BooksService.AddBooksAsync C# (CSharp) Метод

        public async Task AddBooksAsync()
        {
            var b1 = new Book { Title = "Professional C# 5 and .NET 4.5.1", Publisher = "Wrox Press" };
            var b2 = new Book { Title = "Professional C# 2012 and .NET 4.5", Publisher = "Wrox Press" };
            var b3 = new Book { Title = "JavaScript for Kids", Publisher = "Wrox Press" };
            var b4 = new Book { Title = "Web Design with HTML and CSS", Publisher = "For Dummies" };
            _booksContext.AddRange(b1, b2, b3, b4);
            int records = await _booksContext.SaveChangesAsync();

            WriteLine($"{records} records added");
        }