Use BinaryFormatter to serialize user defined class : Binary Formatter : File Directory Stream C# Examples

    
using  System;

using  System.Collections.Generic;
using  System.Text;
using  System.IO;
using  System.Runtime.Serialization;
using  System.Runtime.Serialization.Formatters.Binary;

[Serializable]
public  class  Product  {
        public  long  Id;
        public  string  Name;
        public  double  Price;

        [NonSerialized]
        string  Notes;

        public  Product(long  id,  string  name,  double  price,  string  notes)  {
                Id  =  id;
                Name  =  name;
                Price  =  price;
                Notes  =  notes;
        }

        public  override  string  ToString()  {
                return  string.Format("{0}:  {1}  (${2:F2})  {3}",  Id,  Name,  Price,  Notes);
        }
}
class  Program  {
        static  void  Main(string[]  args)  {
                        List<Product>  products  =  new  List<Product>();
                        products.Add(new  Product(1,  "A",  1000.0,  "s"));
                        products.Add(new  Product(2,  "B",  25.0,  "T"));
                        products.Add(new  Product(4,  "C",  12.0,  "k"));

                        foreach  (Product  product  in  products)  {
                                Console.WriteLine(product);
                        }
                        IFormatter  serializer  =  new  BinaryFormatter();
                        FileStream  saveFile  =  new  FileStream("Products.bin",  FileMode.Create,  FileAccess.Write);
                        serializer.Serialize(saveFile,  products);
                        saveFile.Close();

                        FileStream  loadFile  =new  FileStream("Products.bin",  FileMode.Open,  FileAccess.Read);
                        List<Product>  savedProducts  =  serializer.Deserialize(loadFile)  as  List<Product>;
                        loadFile.Close();
                        foreach  (Product  product  in  savedProducts)  {
                                Console.WriteLine(product);
                        }
        }

}