C#

interface IDoSomething
{
   void DoSomething();
}

interface IDoSomethingFactory
{
   IDoSomething CreateDoSomething();
}

public class ConcreteDoSomething : IDoSomething
{
   public void DoSomething(){Console.WriteLine("Done");}  
}

public class ConcreteDoSomethingFactory : IDoSomethingFactory
{
   public IDoSomething CreateDoSomething()
   {
      return new ConcreteDoSomething();
   }
}

/// Client Code ///

function DoFunkyStuff(IDoSomethingFactory factory)
{
   IDoSomething myObj = factory.CreateDoSomething();
   myObj.DoSomething();
}

private void button1_Click(object sender, System.EventArgs e)
{
        // Set data into the clipboard.
        Point pt = new Point(100, 100);
        Clipboard.SetDataObject(pt, true);
}

private void button2_Click(object sender, System.EventArgs e)
{
    // Get data back from the clipboard
    IDataObject obj = Clipboard.GetDataObject();
    if(obj.GetDataPresent(typeof(Point)))
    {
        Point pt = (Point)obj.GetData(typeof(Point));
        MessageBox.Show(string.Format("X:{0} Y:{1}",
                        pt.X.ToString(), pt.Y.ToString()));
    }
}