class Program
{
    static void Main(string[] args)
    {
        List<Student>students = new List<Student>();
        students.Add(new Student(20));
        students.Add(new Student(30));
        students.Add(new Student(100));
        students.Add(new Student(50));
        foreach (Student s in students)
        {
            Console.WriteLine(s.Score);
        }
        Console.ReadKey(true);
    }
}

class Student
{
    private int _score;
    public int Score { get; set; }

    public Student(int score)
    {
        _score = score;
    }
}