C#

interface IProcess
{
    void Process();
}

class Example : IProcess
{
    public void Process()
    {
        Console.WriteLine("Hello Example.");
    }
}

class Test
{
    [STAThread]
    static void Main()
    {
        Test t = new Test();
        IProcess p = new Example(); // Implicit cast
        t.Fun(p);
    }

    public void Fun(IProcess p)
    {
        p.Process();
    }
}

public override void Install(IDictionary stateSaver)
{
  base.Install(stateSaver);
  using (RegistryKey key = Registry.LocalMachine.OpenSubkey(
    @"SYSTEM\CurrentControlSet\Services\" + serviceInstaller1.ServiceName))
  {
    if (key != null)
      key.SetValue("Description", description);
  }
}
string description;
public string Description
{
  get { return description; }
  set { description = value; }
}

public override void Install(IDictionary stateSaver)<br />
{  <br />
    this.Description = "Blah blah.";<br />
    base.Install(stateSaver); <br />
    string p = @"SYSTEM\CurrentControlSet\Services\" + serviceInstaller1.ServiceName;<br />
    RegistryKey key = Registry.LocalMachine.OpenSubKey(p,true);<br />
    {    <br />
        if (key != null)      <br />
            key.SetValue("Description", description);  <br />
    }<br />
}<br />

bool down;
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
  down = true;
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
  if (down)
  {
    DataObject data = new DataObject(sender.GetType().FullName, sender);
    DoDragDrop(data, DragDropEffects.Move);
 
    down = false; // Don't want to keep doing this
  }
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
  down = false;
}