C#

public class ComboBoxEx : ComboBox<br />
{<br />
  public ComboBoxEx() : base()<br />
  {<br />
			<br />
  }<br />
<br />
<br />
  protected override void WndProc(ref Message m)<br />
  {<br />
    // don't let the combobox get a scroll wheel message<br />
    if (m.Msg == 0x020A /*WM_MOUSEWHEEL*/)<br />
    {<br />
      return;<br />
    }<br />
			<br />
    base.WndProc (ref m);<br />
  }<br />
}

float scale = percentagezoom/100f;
g.Transform = new Matrix(scale,0,0,scale, xoffest, yoffset);

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class Foo : IEditableObject
{
  private struct FooData 
  { 
    public int i;
    public string j;
    public DateTime t;
    public object o;
  }

  private FooData data;
  private FooData old;
 
  public int I
  {
    get { return data.i; }
    set { data.i = value; }
  }
 
  public string J
  {
    get { return data.j; }
    set { data.j = value; }
  }
 
  // Repeat for all members exposed
 
  void BeginEdit()
  {
    old = data; // FooData is a value type so this is making a copy of data
  }
 
  void CancelEdit()
  {
    data = old; // Copy the old values back
  }
 
  void EndEdit()
  {
    // Nothing to do
  }
}