TreeView.SelectedNode Property
Assembly: System.Web (in system.web.dll)
The text of a node in the TreeView control can be in one of two modes: selection mode and navigation mode. By default, a node is in selection mode. To put a node into navigation mode, set the NavigateUrl property for the node to a value other than an empty string (""). To put a node into selection mode, set the NavigateUrl property for the node to empty string ("").
When a node is in selection mode, the user can select a node by clicking on the text in the node. Use the SelectedNode property to determine which node is selected in the TreeView control.
Note: |
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| A node cannot be selected when the TreeView control displays hyperlinks. When hyperlinks are displayed, the SelectedNode property always returns a null reference (Nothing in Visual Basic). |
When the user selects a different node in the TreeView control by clicking the text in the new node, the SelectedNodeChanged event is raised, by default. You can specify a different event by setting the SelectAction property for the property. The following table lists the available options.
| Selection action | Description |
|---|---|
| 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. |
Note: |
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| The HoverNodeStyle is not rendered for a node with its SelectAction property set to TreeNodeSelectAction.None. |
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