using System;

public class Program

{

    public static void Main()

    {

        var a = new Aluno { No = 1 };

        Console.WriteLine("Aluno a No " + a.No.ToString());

        var b = new Aluno();

        b = a;

        b.No = 2;

        Console.WriteLine("Aluno a No " + a.No.ToString());

        Console.WriteLine("Aluno b No " + b.No.ToString());

    }

    public class Aluno

    {

        public int No {get;set;}    

    }

}