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The DevExpress ASP.NET Tree List (ASPxTreeList) supports web hierarchical data sources such as XmlDataSource and SiteMapDataSource. All you have to do is assign the required data source to the ASPxTreeList's DataSource property, or specify its DatasourceID property.

In this demo, the ASPxTreeList is bound to an XmlDataSource object. Use the expand and collapse buttons, or double click a node (the action is specified by the ExpandCollapseAction property), to expand and collapse the node.