using System; using System.Linq; using System.Collections; using System.Collections.Generic; public class Employee { public int id; public string firstName; public string lastName; public static ArrayList GetEmployeesArrayList() { ArrayList al = new ArrayList(); al.Add(new Employee { id = 1, firstName = "J", lastName = "R" }); al.Add(new Employee { id = 2, firstName = "W", lastName = "G" }); al.Add(new Employee { id = 3, firstName = "A", lastName = "H" }); al.Add(new Employee { id = 4, firstName = "D", lastName = "L" }); al.Add(new Employee { id = 101, firstName = "K", lastName = "F" }); return (al); } public static Employee[] GetEmployeesArray() { return ((Employee[])GetEmployeesArrayList().ToArray(typeof(Employee))); } } public class EmployeeOptionEntry { public int id; public long optionsCount; public DateTime dateAwarded; public static EmployeeOptionEntry[] GetEmployeeOptionEntries() { EmployeeOptionEntry[] empOptions = new EmployeeOptionEntry[] { new EmployeeOptionEntry { id = 1, optionsCount = 2, dateAwarded = DateTime.Parse("1999/12/31") }, new EmployeeOptionEntry { id = 101, optionsCount = 2, dateAwarded = DateTime.Parse("1998/12/31") } }; return (empOptions); } } public class MainClass { public static void Main() { IEnumerable<EmployeeOptionEntry> options = EmployeeOptionEntry.GetEmployeeOptionEntries(); long optionsSum = options.Sum(o => o.optionsCount); Console.WriteLine("The sum of the employee options is: {0}", optionsSum); } }