RadDropDownTree supports binding to various types of data sources, including declarative
Some of the declarative data sources like the XmlDataSource and the SiteMapDataSourceare inherently hierarchical.
Therefore when data-bound to these types of data sources, RadDropDownTree automatically creates the node hierarchy.
There is no need to use the DataFieldID and DataFieldParentID
RadDropDownTree supports binding to an ObjectDataSource as well. In
addition to the standard Entry properties (Text, Value, etc.) that
can be bound to the underlying business objects, the DataFieldID
and DataFieldParentID properties can be specified, too. In this
way, RadDropDownTree can create a hierarchy of Entries.
Still, the business objects should provide the data needed for the RadDropDownTree to
build the hierarchy. If the ParentID property of the business objects are of nullable
or reference type, then null values denote root Entry. In case, the ParentID property
is of value type (Integer, Guid, etc.), '0'/'Guid.Empty' values denote the root