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TreeView.OnSelectedNodeChanged Method

Raises the SelectedNodeChanged event of the TreeView control.

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

protected virtual void OnSelectedNodeChanged(
	EventArgs e


Type: System.EventArgs
An System.EventArgs that contains event data.

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 of a node to specify which event is raised when that node is selected.


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

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

The OnSelectedNodeChanged method also allows 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 overriding the OnSelectedNodeChanged method in a derived class, be sure to call the OnSelectedNodeChanged method for the base class so that registered delegates receive the event.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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