using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            Person p = new Person("fabri", "ca",38);
            
            Console.WriteLine(GetSizeOfObject(p));
            Console.Read();
        }
        private static long GetSizeOfObject(object obj)
        {
            long size = 0;
            using (Stream s = new MemoryStream())
            {
                BinaryFormatter formatter = new BinaryFormatter();
                formatter.Serialize(s, obj);
                size = s.Length;
            }
            return size;
        }
    }
    [Serializable]
    public class Person
    {
        public String Nome { get; set; }
        public String Cognome { get; set; }
        public Int16 Age { get; set; }

        public Person(String Nome, String Cognome,Int16 Age)
        {
            this.Nome = Nome;
            this.Cognome = Cognome;
            this.Age = Age;
        }
    }
}