using System;using System.IO;using System.Runtime.Serialization;using System.Runtime.Serialization.Formatters.Binary;public class Test {    public static void Main()      {        // Create a new TestSimpleObject object.        TestSimpleObject obj = new TestSimpleObject();        Console.WriteLine("\n Before serialization the object contains: ");        obj.Print();        // Open a file and serialize the object into binary format.        Stream stream = File.Open("DataFile.dat", FileMode.Create);        BinaryFormatter formatter = new BinaryFormatter();        try        {            formatter.Serialize(stream, obj);                        // Print the object again to see the effect of the             //OnSerializedAttribute.            Console.WriteLine("\n After serialization the object contains: ");            obj.Print();            // Set the original variable to null.            obj = null;            stream.Close();              // Open the file "data.xml" and deserialize the object from it.            stream = File.Open("DataFile.dat", FileMode.Open);            // Deserialize the object from the data file.            obj = (TestSimpleObject)formatter.Deserialize(stream);            Console.WriteLine("\n After deserialization the object contains: ");            obj.Print();        }        catch (SerializationException se)        {            Console.WriteLine("Failed to serialize. Reason: " + se.Message);            throw;        }        catch (Exception exc)        {            Console.WriteLine("An exception occurred. Reason: " + exc.Message);            throw;        }        finally        {            stream.Close();            obj = null;            formatter = null;        }    }}// This is the object that will be serialized and deserialized.[Serializable()]		public class TestSimpleObject  {    // This member is serialized and deserialized with no change.    public int member1;    // The value of this field is set and reset during and     // after serialization.    private string member2;    // This field is not serialized. The OnDeserializedAttribute     // is used to set the member value after serialization.    [NonSerialized()]     public string member3;     // This field is set to null, but populated after deserialization.    private string member4;    // Constructor for the class.    public TestSimpleObject()     {        member1 = 11;        member2 = "Hello World!";        member3 = "This is a nonserialized value";        member4 = null;    }    public void Print()     {        Console.WriteLine("member1 = '{0}'", member1);        Console.WriteLine("member2 = '{0}'", member2);        Console.WriteLine("member3 = '{0}'", member3);        Console.WriteLine("member4 = '{0}'", member4);    }    [OnSerializing()]    internal void OnSerializingMethod(StreamingContext context)    {        member2 = "This value went into the data file during serialization.";    }    [OnSerialized()]    internal void OnSerializedMethod(StreamingContext context)    {        member2 = "This value was reset after serialization.";    }    [OnDeserializing()]    internal void OnDeserializingMethod(StreamingContext context)    {        member3 = "This value was set during deserialization";    }    [OnDeserialized()]    internal void OnDeserializedMethod(StreamingContext context)    {        member4 = "This value was set after deserialization.";    }    }// Output://  Before serialization the object contains: // member1 = '11'// member2 = 'Hello World!'// member3 = 'This is a nonserialized value'// member4 = ''////  After serialization the object contains: // member1 = '11'// member2 = 'This value was reset after serialization.'// member3 = 'This is a nonserialized value'// member4 = ''////  After deserialization the object contains: // member1 = '11'// member2 = 'This value went into the data file during serialization.'// member3 = 'This value was set during deserialization'// member4 = 'This value was set after deserialization.'