Web Forms :: Bind Multiple Delegates To An Event?

Presently i used user control in my total application. i wrote single delegate , single event in to forms like this.

In User Control :

public delegate void onCloseClick();
public event onCloseClick OnCloseClick;

In Form :

In form load i declared --> this.devXToolRibbon1.OnCloseClick += new UBS.Phoenix.WinForm.Common.DevUI.DevXToolRibbon.onCloseClick(devXToolBar1_OnCloseClick);

i implemented event like this...

void devXToolBar1_OnCloseClick()
{
Form.close();
}

i know this much only about delegates & events... when we will bind multiple delegates to an event?