Controls You Can Use on Web Forms   ASP.NET Navigation Controls   TreeView Control

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The TreeView control provides several events that you can program against. This allows you to run a custom routine whenever an event occurs.

NOTE: TreeView control events are raised only when a user interacts with the control, such as when selecting, expanding, or collapsing a node. These events are not raised if the select, expand, or collapse methods are called programmatically.

The following table lists the events supported by the TreeView control.

Event	Description
SelectedNodeChanged	Occurs when a node is selected in the TreeView control.
TreeNodeCheckChanged	Occurs when a check box in the TreeView control changes state between posts to the server. Occurs once for every TreeNode object that changes.
TreeNodeCollapsed	Occurs when a node is collapsed in the TreeView control.
TreeNodeDataBound	Occurs when a data item is bound to a node in the TreeView control.
TreeNodeExpanded	Occurs when a node is expanded in the TreeView control.
TreeNodePopulate	Occurs when a node, with its PopulateOnDemand property set to true, is expanded in the TreeView control.

Binding a TreeView Control to a Data Source   Web Forms Events and Handlers