ListView::OnItemUpdating Method (ListViewUpdateEventArgs^)
Raises the ItemUpdating event.
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
Parameters
- e
-
Type:
System.Web.UI.WebControls::ListViewUpdateEventArgs^
The event data.
| Exception | Condition |
|---|---|
| InvalidOperationException | The ListView control is not bound to a data source control by using the DataSourceID property. |
The ItemUpdating event is raised when an item's Update button is clicked or the UpdateItem method is called, but before the ListView control updates the item. (An Update button is a button control whose CommandName property is set to "Update".) This enables you to perform a custom routine whenever this event occurs, such as canceling the update operation.
Raising an event invokes the event handler through a delegate. For more information, see NIB: Raising an Event.
The OnItemUpdating method also enables 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 you override OnItemUpdating in a derived class, call the base class's OnItemUpdating method so that registered delegates receive the event.
Available since 3.5