using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Users

{

    public class Student

    {       

            public int Id { get; set; }

            public string FirstName { get; set; }

            public string LastName { get; set; }

            public int Age { get; set; }

​

            public Student() { }

            public Student(string fname, string lname, int age)

            {

            FirstName = fname;

            LastName = lname;

            Age = age;

            }

​

            public override string ToString()

            {

                return $"Id:{Id}; FirstName: {FirstName}; LastName: {LastName}; Age: {Age}" ; 

            }

    }

    public class Manager

    {

        List<Student> students = new List<Student>() {new Student("names","lnames" ,12)  };

​

        public  void AddUser(Student entity)

        {

            students.Add(entity);

            Console.WriteLine("Student Added!");

        }

​

        public  void RemoveUser()

        {

            students.RemoveAt(0);

            Console.WriteLine("Students Deleted");

        }

        public  void ShowAll()

        {

            foreach (Student o in students)

            {

                Console.WriteLine(o);

            }

        }

    }

    class Program

    {

        static void Main(string[] args)

        {

            ConsoleColor color = Console.ForegroundColor;

            Console.ForegroundColor = ConsoleColor.Blue;

        bool again = true;

            List<Student> students = new List<Student>();

            Manager manager = new Manager();

            while (again)

            {

                Console.WriteLine(" 1. Add User \n 2. Remove user  \n 3. Show all user");

                Console.WriteLine("Please choose correct options:");

​

​

​

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

​

                switch (command)

                {

                    case 1:

                        Console.Clear();

                        Console.WriteLine("Write your first name");

                        string fname = Console.ReadLine();

                        Console.WriteLine("Write your last name");

                        string lname = Console.ReadLine();

                        Console.WriteLine("Write when born");

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

​

                        Student user = new Student(fname, lname, age);

                        manager.AddUser(user);

                        break;

                    case 2:

                        manager.RemoveUser();

                        Console.WriteLine("Use");

​

                        break;

                    case 3:

                        Console.WriteLine("Показать всех пользователей");

                        manager.ShowAll();

                        break;

                    case 4:

                        again = false;

                        break;

​

                    default:

                        break;

                }

            }

            Console.WriteLine("Are you sure wanna quit?");

            Console.ReadKey();

        }

    }

}

​