https://learn.microsoft.com/ja-jp/dotnet/api/system.web.ui.hierarchicaldatasourceview?view=netframework-4.8.1
HierarchicalDataSourceView Class (System.Web.UI) | Microsoft Learn
Represents a data view on a node or collection of nodes in a hierarchical data structure for a HierarchicalDataSourceControl control.
class systemweb uimicrosoftlearn