using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var books = new List<Book> 

        {

            new Book {Title = "C# in Depth", ISBN = "161729134X", Authors = new List<string> {"John Skeet"}, PublishDate=new DateTime(2013, 4, 22)},

            new Book {Title = "Secrets of the JavaScript Ninja", ISBN = "193398869X", Authors = new List<string> {"JJohn Resig", "Bear Bibeault "}, PublishDate=new DateTime(2014, 5, 17)},

            new Book {Title = "C# 6.0 in a Nutshell: The Definitive Reference", ISBN = "1491927062", Authors = new List<string> {"Joseph Albahari", "Ben Albahari"}, PublishDate=new DateTime(2015, 11, 26)}

        };

        var query = from b in books where b.Title.Contains("C#") select b;

​

        Console.WriteLine(string.Format("All c# books:"));

        query.ToList().ForEach(b => Console.WriteLine(b));

        Console.WriteLine(string.Format("Books printed after 5/1/2014:"));

        var query2 = books.Where(book => book.PublishDate > new DateTime(2014, 5, 1));

        query2.ToList().ForEach(b => Console.WriteLine(b));

        Console.WriteLine(string.Format("Books with more than 1 author:"));

        var query3 = books.Where(book => book.Authors.Count() > 1);

        query3.ToList().ForEach(b => Console.WriteLine(b));

    }

}

​

public class Book

{

    public string Title {get; set;}

    public string ISBN {get; set;}

    public List<string> Authors {get; set;}

    public DateTime PublishDate {get; set;}

    public override string ToString()

    {

        var flattenedAuthors = string.Join(",", Authors);

        var formatedPublishDate = PublishDate.ToString("MM/dd/yyyy");

        return $"{Title} \n {ISBN} \n {flattenedAuthors} \n {formatedPublishDate}";

    }

}

​