SelectedNodeChanged Event

TreeView.SelectedNodeChanged Event


Occurs when a node is selected in the TreeView control.

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

member SelectedNodeChanged : IEvent<EventHandler,

The SelectedNodeChanged event is raised when a node is selected in the TreeView control. This allows you to provide an event-handling method that performs a custom routine, such as updating the displayed content, whenever this event occurs.

You can optionally set the SelectAction property for a node to specify which event is raised when that node is selected. The following table lists the available options.

Selection action



Toggles the node between expanded and collapsed. Raises the TreeNodeExpanded or TreeNodeCollapsed event, as appropriate.


Raises no events when a node is selected.


Raises the SelectedNodeChanged event when a node is selected.


Raises both the SelectedNodeChanged and TreeNodeExpanded events when a node is selected. Nodes are only expanded, never collapsed.


The HoverNodeStyle is not rendered for a node with its SelectAction property set to TreeNodeSelectAction.None.

The SelectedNodeChanged event is fired only on post back when a user clicks a node. The event is not fired if the SelectedNode property is changed programmatically.

For more information about handling events, see NIB: Consuming Events.

The following code example demonstrates how to use the SelectedNodeChanged event to update a Label control when a node is selected in the TreeView control.

.NET Framework
Available since 2.0
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