using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class Person

{

    public string FirstName { get; set; }

    public string LastName { get; set; }

    public string PhoneNumber { get; set; }

}

public static List<Person> People = new List<Person>();

    private static void AddPerson()

{

    Person person = new Person();

​

    Console.Write("Enter First Name: ");

    person.FirstName = Console.ReadLine();

​

    Console.Write("Enter Last Name: ");

    person.LastName = Console.ReadLine();

​

    Console.Write("Enter Phone Number: ");

    person.PhoneNumber = Console.ReadLine();

​

     People.Add(person);

         Console.Write("Contact added sucessfully");

}

    private static void PrintPerson(Person person)

{

    Console.WriteLine("First Name: " + person.FirstName);

    Console.WriteLine("Last Name: " + person.LastName);

    Console.WriteLine("Phone Number: " + person.PhoneNumber);

    Console.WriteLine("-------------------------------------------");

}

        private static void RemovePerson()

{

Console.WriteLine("Enter the first name of the person you would like to remove.");

string firstName = Console.ReadLine();

Person person = People.FirstOrDefault(x => x.FirstName.ToLower() == firstName.ToLower());

            if (person == null)

{

    Console.WriteLine("That person could not be found. Press any key to continue");

}

            Console.WriteLine("Are you sure you want to remove this person from your address book? (Y/N)");

PrintPerson(person);

​

if (123==123)

{

    People.Remove(person);

    Console.WriteLine("Person removed. Press any key to continue.");

}

}

    private static void ListPeople()

{

    if (People.Count == 0)

    {

        Console.WriteLine("Your address book is empty. Press any key to continue.");

       // return;

    }

        else {

    Console.WriteLine("Here are the current people in your address book:\n");

    foreach (var person in People)

    {

        PrintPerson(person);

    }

   // Console.WriteLine("\nPress any key to continue.");

        }

}

    public static void Main()

    {

        Console.WriteLine("Welcome to Contact list");

        AddPerson();

        ListPeople();

        AddPerson();

        ListPeople();

    }

}