C#

protected override bool IsInputKey(Keys data)
{
  return true;
}

// overriden to get the cursor-key-events
protected override bool IsInputKey(Keys data)
{
  bool ret = base.IsInputKey(data);
  if (data==Keys.Up || data==Keys.Down || data==Keys.Left || data==Keys.Right)
    return true;
  else
    return ret;
}

using System;
using System.Drawing;
using System.Windows.Forms;

public class LightLabel : System.Windows.Forms.Control
{
  public LightLabel() : base()
  { 
    // Nothing to set here
  }
 
  public override void OnPaint(PaintEventArgs e)
  {
    Brush textBrush = new SolidBrush(ForeColor);
    Brush background = new SolidBrush(BackColor);
    
    Graphics g = e.Graphics;
    
    g.FillRectangle(background, Bounds);
    g.DrawString(Text, Font, textBrush, Bounds);
 
    textBrush.Dispose();
    background.Dispose();
  }
}

using System;
using System.Runtime.Serialization.Formatter.Binary;
using System.IO;

[Serializable()]
public class MyClass
{
  public int MyInt;
  private int privateInt;
 
  public MyClass(int pub, int pri)
  {
    MyInt = pub;
    privateInt = pri;
  }
  
  public void PrintOut()
  {
    Console.WriteLine("MyInt = {0}, privateInt = {1}", MyInt.ToString(), privateInt.ToString());
  }
}
 
public class Driver
{
  public static void Main()
  {
    MyClass myClass = new MyClass(4, 2);

    // Save the instance to a file
    FileStream stream = new FileStream("C:\\myclass.bin", FileMode.CreateNew, FileAccess.Write);
    IFormatter formatter = new BinaryFormatter();
  
    // Actually does the saving
    formatter.Serialize(myClass);
    // Close the file
    stream.Close();
 
    // Set MyClass to null so that there are no handles to it anymore
    myClass = null;
 
 
    // Read the instance from the file
    stream = new FileStream("C:\\myclass.bin", FileMode.Open, FileAccess.Read);
  
    // Actually create the class instance from the file
    myClass = (MyClass) formatter.Deserialize(stream);
 
    // Close the stream
    stream.Close();

    // Show that all data was saved, public AND private
    myClass.PrintOut();
  }
}