The System.Web.UI.WebControls.FormView control raises the FormView.ItemUpdating event when an Update button (a button with its CommandName property set to "Update") within the control is clicked, but before the System.Web.UI.WebControls.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 System.Web.UI.WebControls.FormViewUpdateEventArgs object is passed to the event-handling method, which allows you to determine the value of an optional command argument sent to the System.Web.UI.WebControls.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 FormViewUpdateEventArgs.CommandArgument property to determine the value of the command argument. To cancel the update operation, set the System.ComponentModel.CancelEventArgs.Cancel property to true. You can also read or modify the new values entered by the user by using the FormViewUpdatedEventArgs.Keys and FormViewUpdateEventArgs.NewValues properties. The FormViewUpdateEventArgs.Keys property contains the key fields, while the FormViewUpdateEventArgs.NewValues property contains the non-key fields. If you need to access the original non-key field values, use the FormViewUpdatedEventArgs.OldValues property.

For more information about handling events, see Consuming Events.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in System.Web.dll)
Assembly Versions: 2.0.0.0
Since: .NET 2.0