The PlaceHolder class is designed to store server controls you add to a Web page at run time. Here's the hierarchy of this class:
Object Control PlaceHolder
This class doesn't have any non-inherited members; to add controls to a place holder, you use its Controls collection's Add member. See the next topic for an example. Note that as with other Web server controls, I am not listing the notable properties, methods, and events this class inherits from the Control and WebControl classes—you can find them in Tables 15.1 to 15.5.