NodeDataBound | RadTreeView for ASP.NET AJAX Documentation
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The NodeDataBound fires for every Node that is bound to data. Use the RadTreeNodeEventArgs to access the properties of the bound Node. Use the Node's DataItem property to access the underlying object or data row being bound to.

Binding to a database:

protected void RadTreeView1_NodeDataBound(object sender, RadTreeNodeEventArgs e) 
    e.Node.ToolTip = (e.Node.DataItem as DataRowView)["Description"].ToString(); 
Protected Sub RadTreeView1_NodeDataBound(ByVal sender As Object, ByVal e As RadTreeNodeEventArgs)
    e.Node.ToolTip = (TryCast(e.Node.DataItem, DataRowView))("Description").ToString()
End Sub

Binding to XML datasource:

protected void RadTreeView_OnNodeDataBound(object sender, RadTreeNodeEventArgs e)
    XmlElement element = (XmlElement)e.Node.DataItem;        
    e.Node.ToolTip = element.GetAttribute("ToolTip"); 
    e.Node.Attributes["NodeType"] = element.GetAttribute("NodeType");        
    e.Node.Attributes["LevelID"] = element.GetAttribute("LevelID");
Protected Sub RadTreeView_OnNodeDataBound(ByVal sender As Object, ByVal e As RadTreeNodeEventArgs)
    Dim element As XmlElement = DirectCast(e.Node.DataItem, XmlElement)
    e.Node.ToolTip = element.GetAttribute("ToolTip")
    e.Node.Attributes("NodeType") = element.GetAttribute("NodeType")
    e.Node.Attributes("LevelID") = element.GetAttribute("LevelID")
End Sub

See Also

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