MaskedTextBox.OnValidating(CancelEventArgs) Method
Important
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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)
A CancelEventArgs that contains event data.
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.
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.
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.
Product | Versions |
---|---|
.NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
Windows Desktop | 3.0, 3.1, 5, 6, 7, 8, 9 |
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