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FormView.ItemUpdating Event

Note: This event is new in the .NET Framework version 2.0.

Occurs when an Update button within a FormView control is clicked, but before the update operation.

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

event FormViewUpdateEventHandler^ ItemUpdating {
	void add (FormViewUpdateEventHandler^ value);
	void remove (FormViewUpdateEventHandler^ value);
/** @event */
public void add_ItemUpdating (FormViewUpdateEventHandler value)

/** @event */
public void remove_ItemUpdating (FormViewUpdateEventHandler value)

JScript supports the use of events, but not the declaration of new ones.

The FormView control raises the ItemUpdating event when an Update button (a button with its CommandName property set to "Update") within the control is clicked, but before the FormView control updates the record. This allows you to provide an event-handling method that performs a custom routine, such as HTML encoding the values of a record before updating it in the data source, whenever this event occurs.

A FormViewUpdateEventArgs object is passed to the event-handling method, which allows you to determine the value of an optional command argument sent to the FormView control and to indicate that the update operation should be canceled. The command argument value corresponds to the CommandArgument property of the Update button. When the CommandArgument property of the Update button is set, use the CommandArgument property to determine the value of the command argument. To cancel the update operation, set the Cancel property to true. You can also read or modify the new values entered by the user by using the Keys and NewValues properties. The Keys property contains the key fields, while the NewValues property contains the non-key fields. If you need to access the original non-key field values, use the OldValues property.

For more information about handling events, see Consuming Events.

The following example demonstrates how to use the ItemUpdating event to cancel an update operation.

No code example is currently available or this language may not be supported.

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

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