using System;

using System.Runtime.Serialization;

using System.Runtime.Serialization.Formatters.Binary;

using System.IO                 ;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        long size = 0;

        object o = new object();

        using (Stream s = new MemoryStream()) {

        BinaryFormatter formatter = new BinaryFormatter();

        formatter.Serialize(s, o);

        size = s.Length;

        Console.WriteLine("Size " + size);

        }

    }

}