c# - LINQ 8

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Customer
    {
        public string ID { get; set; }
        public string City { get; set; }
        public string Country { get; set; }
        public string Region { get; set; }
        public decimal Sales { get; set; }
        public override string ToString()
        {
            return "ID: " + ID + " City: " + City + " Country: " + Country +
            " Region: " + Region + " Sales: " + Sales;
        }
    }
    public class Program
    {
        static void Main(string[] args)
        {
            List<Customer> customers = new List<Customer> {
            new Customer { ID="A", City="New York", Country="USA", Region="North America", Sales=9999 },
            new Customer { ID="B", City="Mumbai", Country="India", Region="Asia", Sales=8888 },
            new Customer { ID="C", City="Karachi", Country="Pakistan", Region="Asia", Sales=7777 },
            new Customer { ID="D", City="Delhi", Country="India", Region="Asia", Sales=6666 },
            new Customer { ID="E", City="São Paulo", Country="Brazil", Region="South America", Sales=5555 },
            new Customer { ID="F", City="Moscow", Country="Russia", Region="Europe", Sales=4444 },
            new Customer { ID="G", City="Seoul", Country="Korea", Region="Asia", Sales=3333 },
            new Customer { ID="H", City="Istanbul", Country="Turkey", Region="Asia", Sales=2222 },
            new Customer { ID="I", City="Shanghai", Country="China", Region="Asia", Sales=1111 },
            new Customer { ID="J", City="Lagos", Country="Nigeria", Region="Africa", Sales=1000 },
            new Customer { ID="K", City="Mexico City", Country="Mexico", Region="North America", Sales=2000 },
            new Customer { ID="L", City="Jakarta", Country="Indonesia", Region="Asia", Sales=3000 },
            new Customer { ID="M", City="Tokyo", Country="Japan", Region="Asia", Sales=4000 },
            new Customer { ID="N", City="Los Angeles", Country="USA", Region="North America", Sales=5000 },
            new Customer { ID="O", City="Cairo", Country="Egypt", Region="Africa", Sales=6000 },
            new Customer { ID="P", City="Tehran", Country="Iran", Region="Asia", Sales=7000 },
            new Customer { ID="Q", City="London", Country="UK", Region="Europe", Sales=8000 },
            new Customer { ID="R", City="Beijing", Country="China", Region="Asia", Sales=9000 },
            new Customer { ID="S", City="Bogotá", Country="Colombia", Region="South America", Sales=1001 },
            new Customer { ID="T", City="Lima", Country="Peru", Region="South America", Sales=2002 }
        };
            var queryResults =
            from c in customers
            where c.Region == "Asia"
            select c
            ;
            bool anyUSA = customers.Any(c => c.Country == "USA");
            if (anyUSA)
            {
                Console.WriteLine("Some customers are in the USA");
            }
            else
            {
                Console.WriteLine("No customers are in the USA");
            }
            bool allAsia = customers.All(c => c.Region == "Asia");
            if (allAsia)
            {
                Console.WriteLine("All customers are in Asia");
            }
            else
            {
                Console.WriteLine("Not all customers are in Asia");
            }
            Console.Write("Program finished, press Enter/Return to continue:");
            Console.ReadLine();
        }
    }
}