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TreeNodeEventArgs.Node Property

Gets the node that raised the event.

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

'Declaration
Public ReadOnly Property Node As TreeNode

Property Value

Type: System.Web.UI.WebControls.TreeNode
A TreeNode that represents the node that raised the event.

Use the Node property to access the properties of the node that raised the event. The Node property returns a TreeNode object and is commonly used to determine the contents of the node, to modify the properties of the node, or to add child nodes dynamically.

The following code example demonstrates how to use the Node property to determine the text value of an expanded node.


<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub Node_Expand(ByVal sender As Object, ByVal e As TreeNodeEventArgs)

    Message.Text = "You expanded the " & e.Node.Text & " node."

  End Sub

  Sub Node_Collapse(ByVal sender As Object, ByVal e As TreeNodeEventArgs)

    Message.Text = "You collapsed the " & e.Node.Text & " node."

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

  <head runat="server">
    <title>TreeView TreeNodeExpand and TreeNodeCollapse Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>TreeView TreeNodeExpand and TreeNodeCollapse Example</h3>

      <asp:TreeView id="BookTreeView"
        ExpandDepth="1"
        OnTreeNodeExpanded="Node_Expand"
        OnTreeNodeCollapsed="Node_Collapse"
        runat="server">

        <Nodes>

          <asp:TreeNode Value="Chapter 1" 
            Text="Chapter 1">

            <asp:TreeNode Value="Section 1"
              Text="Section 1">

              <asp:TreeNode Value="Paragraph 1" 
                Text="Paragraph 1">
              </asp:TreeNode>

            </asp:TreeNode>

            <asp:TreeNode Value="Section 2" 
              Text="Section 2">
            </asp:TreeNode>

          </asp:TreeNode>

        </Nodes>

      </asp:TreeView>

      <br />

      <asp:Label id="Message" runat="server"/>

    </form>
  </body>
</html>

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0
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