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ListView::OnItemInserting Method

Raises the ItemInserting event.

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

protected:
virtual void OnItemInserting(
	ListViewInsertEventArgs^ e
)

ExceptionCondition
InvalidOperationException

The ListView control is not bound to a data source control by using the DataSourceID property.

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.

The OnItemInserting method is called by the ListView control to raise the ItemInserting event. It is typically used by control developers when extending the ListView class.

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

The OnItemInserting 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 OnItemInserting in a derived class, call the base class's OnItemInserting method so that registered delegates receive the event.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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