using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

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

        //If your end goal is just to add an object to a list, you dont need to instantiate it into a variable, just instantiate it in the Add() method

        students.Add(new Student()

        {

            Name = "Hope Ajayi",

            Number = "08185543124",

            Address = "Metropolitan Council",

            Guardian = new Guardian()

            {

                Name = "Kinyo Yemi",

                Number = "08012345678",

                Address = "Bunker Street",

                WorkPhone = "555123456"

            }           

        });

        students.Add(new Student()

        {

            Name = "Morak Suleiman",

            Number = "08535755543",

            Address = "Sederal Low Cost",

            Guardian = new Guardian()

            {

                Name = "Awwal Kadi",

                Number = "08072523245",

                Address = "R32 Damboa",

                WorkPhone = "23432432423"

            }           

        });

        foreach (var x in students)

        {

            Console.WriteLine(x); //Console.WriteLine will automatically call .ToString() on what you pass to it.

            Console.WriteLine();

        }

    }

    public interface IIndividual

    {

        string Name { get; set; }

        string Number { get; set; }

        string Address { get; set; }

    }

    public interface IGuardian: IIndividual

    {

        string WorkPhone { get; set; }

    }

​

    public class Student: IIndividual

    {

        public IGuardian Guardian { get; set; }

        public string Name { get; set; }

        public string Number { get; set; }

        public string Address { get; set; }

        //Overide objects ToString() method if you want a string representation of your object, this is what its here for

        public override string ToString()

        {

            return $"Name:{Name}\nNumber:{Number}\nAddress:{Address}\nGuardian:\n{Guardian}";

        }

    }

    public class Guardian: IGuardian

    {       

        public string Name { get; set; }

        public string Number { get; set; }

        public string Address { get; set; }

        public string WorkPhone { get; set; }

        //Overide objects ToString() method if you want a string representation of your object, this is what its here for

        public override string ToString()

        {

            return $"Name:{Name}\nNumber:{Number}\nAddress:{Address}\nWorkPhone{WorkPhone}";

        }

    }

}