using System;

using System.Collections.Generic;

using System.Linq;

​

​

namespace Playground

{

    class Program

    {

        private static List<EmployeeDetails> employeeDetails = new List<EmployeeDetails> {

            new EmployeeDetails(1, "350 Buckaway Drive"),

            new EmployeeDetails(2, "12 Main St"),

            new EmployeeDetails(3, "78 Westhurst Road")

        };

        private static List<EmployeeName> employeeNames = new List<EmployeeName> {

            new EmployeeName(1, "John Doe"),

            new EmployeeName(2, "Bambi Granger"),

            new EmployeeName(3, "James McElroy")

        };

​

        static void Main(string[] args)

        {

            List<Employee> employees = employeeDetails.Select(x => new Employee(x.Id, "X", null)).ToList();

            // Combine employeeDetails with employeeNames. The Id should match in both.

​

​

​

            // Verification

            if (employees == null)

            {

                throw new Exception("There are no employees!");

            }

​

​

            if (employees.Count != employeeDetails.Count)

            {

                throw new Exception("There are not enough employees!");

            }

            foreach(var employee in employees)

            {

                if (string.IsNullOrEmpty(employee.Address) || string.IsNullOrEmpty(employee.Name))

                {

                    throw new Exception("Employee data incomplete!");

                }

                Console.WriteLine(employee);

            }

        }

​

​

        public class EmployeeName

        {

            public int Id { get; set; }

            public string Name {get ; set; }

​

            public EmployeeName(int id, string name)

            {

                Id = id;

                Name = name;

            }

        }

        public class EmployeeDetails

        {

            public int Id { get; set; }

            public string Address { get ;set; }

​

            public EmployeeDetails(int id, string address)

            {

                Id = id;

                Address = address;

            }

        }

​

        public class Employee

        {

            public int Id { get; set; }

            public string Name { get; set; }

            public string Address { get; set; }

​

            public Employee(int id, string name, string address)

            {

                Id = id;

                Name = name;

                Address = address;

            }

​

            public override string ToString()

            {

                return $"{Id} - {Name} - {Address}";

            }

        }

    }

}

​