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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
)

Parameters

e
Type: System.ComponentModel.CancelEventArgs

A CancelEventArgs that contains event data.

ExceptionCondition
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 Handling and Raising Events.

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.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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