using System;

using System.Collections;                       //Adding System.Collections

​

public class Student

{

    public string Name

    {

        get;

        set;

    }

​

    public int Age

    {

        get;

        set;

    }

​

    public double Mark

    {

        get;

        set;

    }

​

    public Student(string name, int age, double mark)

    {

        Name = name;

        Age = age;

        Mark = mark;

    }

}

​

public class Program

{

    public static void Main()

    {

        Student S1 = new Student("Abhi", 17, 98);

        Student S2 = new Student("George", 20, 90.5);

        Student S3 = new Student("Kevin", 22, 99.5);

        Hashtable studHT = new Hashtable();         //Creating Hashtable studHT to store all Student objects

    }

}