public class Book
{
    //Auto implemented properties
    public string Name { get; set; }
    public int ID { get; set; }
}
public class AllLINQ
{
    public static void ShowAll()
    {
        //Collection Initializer and Implicitly Typed Local Variables using 'var'.
        //Note how List<Book> is created and filled in one line of source code.
        var Books = new List<Book> { new Book { Name = "Learn C#", ID = 1 },
            new Book { Name = "Learn .Net", ID = 2 },
            new Book { Name = "Power Electronics", ID = 3 } };
        //LINQ
        var BooksQuery = from book in Books
                        //calling extesion method
                        where book.IsLearningSeries()
                        //Anonymous Type
                        select new { FetchedBook=book, TimeStamp=System.DateTime.Now };
        foreach (var SearchedResult in BooksQuery)
        {
            Console.WriteLine(" Searched at : " + SearchedResult.TimeStamp);
            Console.WriteLine(" Book Name : " + SearchedResult.FetchedBook.Name + ",
                                        Book ID = " + SearchedResult.FetchedBook.ID);
        }
    }
}
public static class Extensions
{
    //Extension Method for Book class. Note 'this' against parameter.
    public static bool IsLearningSeries(this Book b)
    {
        return b.Name.Contains("Learn");
    }
}