C# Program to Produce a filtered sequence of elements that contain only one property of each Student

Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class Programs
{
    public class Student
    {
        public string First { get; set; }
        public string Last { get; set; }
        public int ID { get; set; }
        public List Marks;
        public ContactInfo GetContactInfo(Programs pg, int id)
        {
            ContactInfo allinfo =
                (from ci in pg.contactList
                 where ci.ID == id
                 select ci)
                .FirstOrDefault();

            return allinfo;
        }

        public override string ToString()
        {
            return First + "" + Last + " :  " + ID;
        }
    }

    public class ContactInfo
    {
        public int ID { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
        public override string ToString() { return Email + "," + Phone; }
    }

    public class ScoreInfo
    {
        public double Average { get; set; }
        public int ID { get; set; }
    }
    List students = new List()
        {
             new Student {First="Tom", Last=".S", ID=1, Marks= new List() {97, 92, 81, 60}},
             new Student {First="Jerry", Last=".M", ID=2, Marks= new List() {75, 84, 91, 39}},
             new Student {First="Bob", Last=".P", ID=3, Marks= new List() {88, 94, 65, 91}},
             new Student {First="Mark", Last=".G", ID=4, Marks= new List() {97, 89, 85, 82}},
        };
    List contactList = new List()
        {
            new ContactInfo {ID=111, Email="Tom@abc.com", Phone="9328298765"},
            new ContactInfo {ID=112, Email="Jerry123@aaa.com", Phone="9876543201"},
            new ContactInfo {ID=113, Email="Bobstar@aaa.com", Phone="9087467653"},
            new ContactInfo {ID=114, Email="Markantony@qqq.com", Phone="9870098761"}
        };


    static void Main(string[] args)
    {
        Programs pg = new Programs();
        IEnumerable studentQuery2 =
                from student in pg.students
                where student.ID > 1
                select student.Last;

        Console.WriteLine("\r\n studentQuery2: select range_variable.Property");
        foreach (string s in studentQuery2)
        {
            Console.WriteLine(s);
        }

        Console.ReadLine();
    }
}


Output:

 studentQuery2: select range_variable.Property
.M
.P
.G


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