ASPxTreeList.NodeUpdating Event

Enables you to prevent a node from being updated.

Namespace: DevExpress.Web.ASPxTreeList

Assembly: DevExpress.Web.ASPxTreeList.v24.2.dll

Declaration

C#

public event ASPxDataUpdatingEventHandler NodeUpdating

VB.NET

Public Event NodeUpdating As ASPxDataUpdatingEventHandler

Event Data

The NodeUpdating event's data class is ASPxDataUpdatingEventArgs. The following properties provide information specific to this event:

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
Keys	Gets a dictionary of field name/value pairs that represent the primary key of the row to update.
NewValues	Gets a dictionary that contains the values of the non-key field name/value pairs in the row to be updated.
OldValues	Gets a dictionary that contains the original field name/value pairs in the row to be updated.

Remarks

The NodeUpdating event occurs when an end-user has changed cell values and tries to pass them to the data source by clicking the Update button. To cancel the update operation, set the event parameter’s Cancel property to true.

If you use edit form templates, you must process the update manually in the NodeUpdating event handler.

After a node has been updated, the ASPxTreeList.NodeUpdated event is raised.