using System;

​

public class Person

{

    private string _firstName;

    private string _lastName;

    private string _middleName;

    public Person()

    {

    }

    public Person(String f, String l, String m)

    {

        _firstName = f;

        _lastName = l;

        _middleName = m;

    }

​

    public string FirstName

    {

        get {

            return _firstName;

        }

        set {

            _firstName = value.Trim();

        }

    }

    public string LastName

    {

        get { return _lastName; }

        set { _lastName = value; }

    }

    public string MiddleName

    {

        get {

            return _middleName;

        }

        set {

            _middleName = value.Trim();

        }

    }

    public override string ToString()

    {

        return String.Format("{0}, {1}", _lastName, _firstName, _middleName);

    }

}

​

public class Student

    : Person

{

    public Student()

        : base()

    {

    }

    public Student(int id, string firstName, string lastName, string middleName)

        : base(firstName, lastName, middleName)

    {

        StudentId = id;

    }

    public int StudentId { get;set; }

    public override string ToString()

    {

        return String.Format("{2}, {1}, {0}, ({3})", LastName, FirstName, MiddleName, StudentId);

    }

}

​

var me = new Student(1, "Alec", "Patrick", "Martin");

Console.WriteLine(me);

​

​