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DataControlField::OnFieldChanged Method

Raises the FieldChanged event.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

protected:
virtual void OnFieldChanged()

The OnFieldChanged method raises an event signaling that the DataControlField object's state has changed. Changes to the following properties cause this event to be raised: FooterText, HeaderImageUrl, HeaderText, ShowHeader, SortExpression, and Visible. Derived type properties also raise this event when state changes occur. Web server controls such as DetailsView and GridView typically call the DataBind method in response to a field change event.

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

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
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