using System;

using System.Collections.Generic;

​

public class Student

{

    public string Name{set; get;}

    public int Age{set; get;}

    //This is Constructor

    public Student (String Name, int Age){

        this.Name=Name;

        this.Age=Age;

    }       

}

​

public class Grade

{

    public string Name{set; get;}

    public int No{set; get;}

    public Grade (String Name)

    {

        this.Name=Name;

        this.No=0;

    }   

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

    public void AddStudents(Student t)

    {

    a.Add(t);

        this.No += 1;

    }   

}

​

​

public class Test

{

    public static void Main()

    {

        //This is Instance where s1 is Object

        Student s1 = new Student ("Sylvia", 20 );

        Student s2 = new Student ("Awe", 22 );

        Student s3 = new Student ("Sylvia", 20 );

        Student s4 = new Student ("Sylvia", 20 );

        Student s5 = new Student ("Sylvia", 20 );

        Grade z1 = new Grade("BBS");

        Grade z2 = new Grade("BCA");

        z1.AddStudents(s1);

        z1.AddStudents(s3);

        z1.AddStudents(s4);

        z1.AddStudents(s5);

        z2.AddStudents(s2);

        Console.WriteLine("Total No in BBS is:" + z1.No);

        Console.WriteLine("Total No in BCA is:" + z2.No);

    }

}

​

​