MaskedTextBox::OnValidating Method (CancelEventArgs^)
Raises the Validating event.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Parameters
- e
-
Type:
System.ComponentModel::CancelEventArgs^
A CancelEventArgs that contains event data.
| Exception | Condition |
|---|---|
| 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.
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 in a derived class, be sure to call the base class's OnValidating method so that registered delegates receive the event.
Available since 2.0
