A、Apply the TemplateContainerAttribute to a property of type ITemplate. Pass the type of the template's naming container as the argument to the attribute.
B、Apply the TemplateContainerAttribute to the user control's class declaration.
C、Implement a property of type INamingContainer in the user control's code-behind class.
D、Implement a property of type ITemplate in the user control's code-behind class.
E、Define a new class that inherits from the ITemplate interface. Implement the InstantiateIn method of the ITemplate interface.