using System;

using System.Collections.Generic;

using System.Linq;

using  System.Text.Json;

​

class Student

{

    public string FirstName { get; set; }

    public string LastName {get; set;}

    public int Id { get; set; }

    public string Street { get; set; }

    public string City { get; set; }

    public List<int> Scores;

}

​

public class Program

{   

    public static void Main()

    {   

        var students =  new List<Student>()

        {

            new Student 

            { 

                FirstName="Svetlana",

                LastName="Omelchenko",

                Id=111,

                Street="123 Main Street",

                City="Seattle",

                Scores= new List<int> { 97, 92, 81, 60 } 

            },

            new Student { 

                FirstName="Claire",

                LastName="O’Donnell",

                Id=112,

                Street="124 Main Street",

                City="Redmond",

                Scores= new List<int> { 75, 84, 91, 39 } 

            },

            new Student { 

                FirstName="Sven",

                LastName="Mortensen",

                Id=113,

                Street="125 Main Street",

                City="Lake City",

                Scores= new List<int> { 88, 94, 65, 91 } 

            },

        };

        // replace

        var result = students;

        Console.WriteLine(JsonSerializer.Serialize(result, new JsonSerializerOptions() { WriteIndented = true }));

    }

}

​