using System;
using System.Collections.Generic;
using System.Linq;


class LINQtoArray
{
    static void Main(string[] args)
    {
        int[] array = { 2, 6, 4, 12, 7, 8, 9, 13, 2 };

        var filteredArray =
            from element in array
            where element < 7
            select element;

        PrintArray(filteredArray, "All values less than 7:");

        var orderedFilteredArray =
            from element in filteredArray
            orderby element descending
            select element;

        PrintArray(orderedFilteredArray, "All values less than 7 and sorted:");
    }

    public static void PrintArray(IEnumerable<int> arr,string message)
    {
        Console.Write("{0}",message);

        foreach (var element in arr)
            Console.Write(" {0}", element);

        Console.WriteLine();
    }
}