using System;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var alpha = new Student("Dave");

        Console.WriteLine(alpha.FirstName);

    }

}

​

public class Person

{

    public string FirstName

    {

        get;

        set;

    }

}

​

public class Student : Person

{

    public Student(string firstName)

    {

        this.FirstName = firstName;

    }

}