Raises the KeyDown event.
[Visual Basic] Protected Overridable Sub OnTextBoxKeyDown( _ ByVal source As Object, _ ByVal e As KeyEventArgs _ ) [C#] protected virtual void OnTextBoxKeyDown( object source, KeyEventArgs e ); [C++] protected: virtual void OnTextBoxKeyDown( Object* source, KeyEventArgs* e ); [JScript] protected function OnTextBoxKeyDown( source : Object, e : KeyEventArgs );
- The source of the event.
- A KeyEventArgs that contains the event data.
If the InterceptArrowKeys property is set to true and the key being pressed is the UP ARROW key, the UpButton method is called. Likewise, if the key being pressed is the DOWN ARROW key, the DownButton method is called.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The OnTextBoxKeyDown 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 OnTextBoxKeyDown in a derived class, be sure to call the base class's OnTextBoxKeyDown 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