using System;

public class Program

{

    public static void Main()

    {

        // You can only unbox value which has already been boxed

        // else it will throw exception

        int i = 56;

        object obj = i;

        var unboxedi = (int)i;

        Console.WriteLine(i);

        Console.WriteLine(obj);

        Console.WriteLine(unboxedi);

        object o = "";

        var unboxed = (int)o;

    }

}