This documentation is archived and is not being maintained.

MaskedTextBox.OnValidating Method

Raises the Validating event.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

protected override void OnValidating (
	CancelEventArgs e
)
protected void OnValidating (
	CancelEventArgs e
)
protected override function OnValidating (
	e : CancelEventArgs
)
Not applicable.

Parameters

e

A CancelEventArgs that contains event data.

Exception typeCondition

Exception

A critical exception occurred during the parsing of the input string.

The OnValidating method causes the input string to be validated against the ValidatingType property, if a Type has been specified for this property. It will then also raise the TypeValidationCompleted event.

NoteNote:

To ensure consistency with text-based controls, validation will occur even if the MaskedTextBox is read-only (its ReadOnly property is set to true).

Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.

The OnValidating 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 OnValidating in a derived class, be sure to call the base class's OnValidating method so that registered delegates receive the event.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0
Show: