System.Web.UI.WebControls Namespace   TreeView Class

.NET Framework version 2.0

Returns a TreeNode object that represents the selected node in a TreeView control.

This property can only be used programmatically; it cannot be set when declaring the control.

The property is read only with no default value.

Use the SelectedNode property to determine which node is selected in a TreeView control.

The text of a node in a TreeView control can be in one of two modes: selection mode and navigation mode. A node is in navigation mode when the NavigateUrl property for the node is set to a value other than an empty string. Otherwise, the node is in selection mode, wherein the user can select a node by clicking on the node text.

NOTE: When a node is in navigation mode, the SelectedNode property returns a null reference ( Nothing in Visual Basic ).

When the user selects a different node in the TreeView control, the SelectedNodeChanged event is raised by default. The TreeView supports specifying a different event to be raised, based on the setting of the SelectAction property. The following table lists the available options.

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

The following example demonstrates how to use the SelectedNode property to determine which node is selected in a TreeView control.

TreeNode selectedNode = myTreeView.SelectedNode;
message.Text = "Selected TreeNode Value: " + selectedNode.Value;

Dim selectedNode As TreeNode = myTreeView.SelectedNode
message.Text = "Selected TreeNode ValuePath: " + selectedNode.Value

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TreeView Members   SelectedValue   Text   Value