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UpDownBase.OnMouseWheel Method

Raises the MouseWheel event.

[Visual Basic]
Overrides Protected Sub OnMouseWheel( _
   ByVal e As MouseEventArgs _
protected override void OnMouseWheel(
 MouseEventArgs e
protected: void OnMouseWheel(
 MouseEventArgs* e
protected override function OnMouseWheel(
   e : MouseEventArgs


A MouseEventArgs that contains the event data.


If the up-down control has focus when this event occurs, the direction the mouse wheel scrolled 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 OnTextBoxTextChanged 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 OnTextBoxTextChanged in a derived class, be sure to call the base class's OnTextBoxTextChanged method so that registered delegates receive the event.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

UpDownBase Class | UpDownBase Members | System.Windows.Forms Namespace | UpButton | DownButton