using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int i = 5;

        int n = 5;

        object boxedI = i;

        object boxedN = n;

        Console.WriteLine("i == n ? " + (i == n) ); //true

        Console.WriteLine("bI == bN ? " + (boxedI == boxedN) ); //false

        Dictionary<object,int> _dict = new Dictionary<object,int> ();

        _dict.Add(boxedI,5);

        Console.WriteLine("_dict contains boxedI? " + _dict.ContainsKey(boxedI) );

        Console.WriteLine("_dict contains boxedN? " + _dict.ContainsKey(boxedN) );

        _dict.Add(boxedN,5);//exception

    }

}