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// Open a file and serialize the object into it in binary format.
// EmployeeInfo.osl is the file that we are creating. 
// Note:- you can give any extension you want for your file
// If you use custom extensions, then the user will now 
//   that the file is associated with your program.
Stream stream = File.Open("EmployeeInfo.osl", FileMode.Create);
BinaryFormatter bformatter = new BinaryFormatter();
            
Console.WriteLine("Writing Employee Information");
bformatter.Serialize(stream, mp);
stream.Close();


Stream stream = File.Open("Categories.dat", FileMode.Create);
                    BinaryFormatter bformatter = new BinaryFormatter();

                    bformatter.Serialize(stream, categories);
                    stream.Close();

namespace MyObjSerial
{
    [Serializable()]    //Set this attribute to all the classes that want to serialize
    public class Employee : ISerializable //derive your class from ISerializable
    {
        public int EmpId;
        public string EmpName;
        
        //Default constructor
        public Employee()
        {
            EmpId = 0;
            EmpName = null;
        }
        }
}

//Open the file written above and read values from it.
stream = File.Open("EmployeeInfo.osl", FileMode.Open);
bformatter = new BinaryFormatter();
        
Console.WriteLine("Reading Employee Information");
mp = (Employee)bformatter.Deserialize(stream);
stream.Close();
            
Console.WriteLine("Employee Id: {0}",mp.EmpId.ToString());
Console.WriteLine("Employee Name: {0}",mp.EmpName);


Stream stream = File.Open("Categories.dat", FileMode.Open);

            BinaryFormatter bf = new BinaryFormatter();
            categories = new List<Category>();
            categories = (List<Category>)bf.Deserialize(stream);

            foreach (var cat in categories)
            {
                Console.WriteLine("Cat: " + cat.Description + " number: " + cat.CategoryNumber);
            }