Сериализация объектов - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
 
namespace GromadskaBezpeka
{
   [Serializable()]
    public class PlanVikoristannya
    {
        
            }
}
 
//а при тесте:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using GromadskaBezpeka;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.IO;
 
namespace сериализация
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            PlanVikoristannya plan = new PlanVikoristannya();
            BinaryFormatter formater = new BinaryFormatter();
            Stream serialStream = new FileStream("serverValueInfo", FileMode.Create);
            formater.Serialize(serialStream, plan);
            serialStream.Close();
 
        }
    }
}