Assembly: System.Windows.Forms (in system.windows.forms.dll)
If the spin box (also known as an up-down control) has focus when this event occurs, the direction the user scrolled the mouse wheel is determined, and either the UpButton or DownButton method is called.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The OnMouseWheel method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.Notes to Inheritors When overriding OnMouseWheel in a derived class, be sure to call the base class's OnMouseWheel method so that registered delegates receive the event.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.