Raises the ItemInserting event.
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
The ListView control raises the ItemInserting event when an Insert button in the control is clicked or the InsertNewItem method is called, but before the ListView control inserts the record. (An Insert button is a button control whose CommandName property is set to "Insert".) This enables you to perform a custom routine whenever this event occurs, such as HTML-encoding or validating the values of a record before it is inserted in the data source.
Raising an event invokes the event handler through a delegate. For more information, see Raising an Event.
The 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 in a derived class, call the base class's method so that registered delegates receive the event.