using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

​

    public static void Main()

    {

        var foo = new List<string>() {"apple", "orange", "grape"};

        var bar = new List<int>() {1,2,3,4,5};

        var result = from food in foo

                     from val in bar

                     where food.Length <= 5

                     where val % 2 == 0

                     select food + " = " + val.ToString();      

        foreach (var r in result)

            Console.WriteLine(r);

​

        var result2 =   foo.Where(x => x.Length <= 5);

                        //bar.Where(y => y % 2 == 0);

        foreach (var r in result2)

            Console.WriteLine(r);

    }

}