using System;

using System.Collections.Generic;

​

public class Employee

{

    public string Name { get; set; }

    public string Title { get; set; }

    public string Department { get; set; }

    public DateTime DateOfHire { get; set; }

}

​

public class EmployeeCollection : Dictionary<int, Employee>

{

    public void AddEmployee(Employee employee)

    {

        if (!ContainsKey(employee.Key))

        {

            Insert(employee.Key, employee);

        }

    }

​

    public void PrintEmployees()

    {

        foreach (var item in this)

        {

            Console.WriteLine(string.Format("{0} {1} {2} {3}", item.Key.ToString(), item.Value.Name, item.Value.Title, item.Value.DateOfHire.ToShortDateString()));

        }

    }

}

​

public class MainClass

{

    public void menu() // add a menu here

    {

        Console.WriteLine("Main Menu");

        Console.WriteLine("1. Add Employee");

        Console.WriteLine("2. Print Employees");

        Console.WriteLine("3. Exit");

        Console.WriteLine("Enter the number of the desired option:");

        int selectedOption = Convert.ToInt32(Console.ReadLine());

        switch (selectedOption)

        {

            case 1:

                Console.WriteLine("Enter the employee's name:");

                string name = Console.ReadLine();

                Console.WriteLine("Enter the employee's title:");

                string title = Console.ReadLine();

                Console.WriteLine("Enter the employee's department:");

                string department = Console.ReadLine();

                Console.WriteLine("Enter the employee's start date in the format of mm/dd/yyyy:");

                DateTime dateOfHire = DateTime.ParseExact(Console.ReadLine(), "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture);

                var employee = new Employee

                {

                    Name = name,

                    Title = title,