List<int> pairsForeach = new List<int>();
           foreach(int n in numbers)
           {
               if (n % 2 == 0)
               {
                   pairsForeach.Add(n);
               }
           }

           List<int> pairsLinqQuery = (from n in numbers where (n % 2 == 0) select n).ToList<int>();

           List<int> pairsLinqLambda = numbers.Where(n => n % 2 == 0).ToList<int>();