MaskedTextBox.OnValidating(CancelEventArgs) Method

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Raises the Validating event.

protected:
 override void OnValidating(System::ComponentModel::CancelEventArgs ^ e);

protected override void OnValidating (System.ComponentModel.CancelEventArgs e);

override this.OnValidating : System.ComponentModel.CancelEventArgs -> unit

Protected Overrides Sub OnValidating (e As CancelEventArgs)

Parameters

e: CancelEventArgs

A CancelEventArgs that contains event data.

Exceptions

Exception

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

Remarks

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.

Note

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

Applies to