C#

namespace DoubleBufferPanelNameSpace
{
    class DoubleBufferPanel : Panel
    {
        public DoubleBufferPanel()
        {
            this.SetStyle(ControlStyles.AllPaintingInWmPaint |
                     ControlStyles.UserPaint |
                     ControlStyles.DoubleBuffer |
                     ControlStyles.ResizeRedraw,
                     true);
            this.UpdateStyles();
        }
    }
}

class Address
{    
    // An address is composed of several fields
    private byte _FieldA;
    private byte _FieldB;
    private byte _FieldC;

    // Each field is exposed with a public property
    public byte FieldA
    {
        set { _FieldA = value; }
        get { return _FieldA; }
    }
    // ... and so on for the other fields

    // I have several useful public methods for address manipulation
    public void SetAddress (byte fieldA, byte fieldB, byte fieldC);
    public void DoStuff(...)
    public void DoOtherStuff(...)
    ...
}


class Message
{    
    // A message contains 2 addresses
    public Address SourceAddress = new Address();
    public Address DestAddress = new Address();
}