.net下二进制序列化

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace WindowsApplication2
{ 
        [Serializable]
        public class Object5 
        {
                public int i1 = 0;
                public int i2 = 0;
                public float f3=0; 
                public string str;
        }

                private void button1_Click(object sender, System.EventArgs e)
                {
                        Object5 obj = new Object5();
                        obj.i1 = 128;
                        obj.i2 = 24;
                        obj.f3=1.3f;
                        obj.str = "Some String";

                        double   d1=1.3d;
                        float    f1=1.3f;
                        int      i1=1;
                        string   s1="HelloWorld";

                        System.Runtime.Serialization.IFormatter formatter = new System.Runtime.Serialization.Formatters.Binary.BinaryFormatter();
                        System.IO.Stream stream = new System.IO.FileStream("File.bin", System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.None);
                        formatter.Serialize(stream, obj);
                        formatter.Serialize(stream,d1);
                        formatter.Serialize(stream,f1);
                        formatter.Serialize(stream,i1);
                        formatter.Serialize(stream,s1);

                        stream.Close();
                        formatter=null;
                }
}