[C#/Linq] Linq 그룹절(group) 사용 예제

using System.Xml.Linq; public class Example { public static void Main() { Console.Write("IEnumerable 의 그룹절(group) 사용 \n"); List customers = new List(); customers.Add(new Customer() { City = "Seoul", FirstName = "Code", LastName = "Killer" }); customers.Add(new Customer() { City = "Seoul", FirstName = "Code1", LastName = "Killer1" }); customers.Add(new Customer() { City = "Seoul", FirstName = "Co.....