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UpDownBase.OnTextBoxKeyDown Method

Raises the KeyDown event.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

protected virtual void OnTextBoxKeyDown(
	Object source,
	KeyEventArgs e
)

Parameters

source
Type: System.Object

The source of the event.

e
Type: System.Windows.Forms.KeyEventArgs

A KeyEventArgs that contains the event data.

If the InterceptArrowKeys property is set to true and the user presses the UP ARROW key, the UpButton method is called. Likewise, if the user presses the DOWN ARROW key, the DownButton method is called.

Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.

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.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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