using System; using System.Collections.Generic; using System.Linq; public class MainClass { public static void Main() { var numbers = new List<int>() { 1, 2 }; IEnumerable<int> query = numbers.Select(n => n * 10); foreach (int n in query) Console.Write(n + "|"); numbers.Clear(); foreach (int n in query) Console.Write(n + "|"); } }