using System;

public class Student

{

    int id;// data member( instance variable )

    String name;

    public static void Main()

    {

        Student s1 = new Student();// creating of object

        s1.id = 1;

        s1.name = "ahmad";

        Console.WriteLine(s1.id +"  "+s1.name);

        //Console.WriteLine(s1.name);

        // since c# is object oriented language

        // program is designed using class object

        //برنامه نویسی شی گرا 

        // class is a blue print

        // field, method

        // for implementing this class we need object

        //

        // object is an instance of a class

        // all the members of the class can be accessed through object

        //in c# , object is a real world entity

        //for example: laptop, car, chair, mobile etc

        // object is a runtime enity

        // object has: state and behavior

        // state means data, behavior mean functionality.

        // car objname = new car(); // creating object

        // Class is a group of similar objects

        // class can have fields, methods, constructors 

    }

}