The last control we'll take a look at in this chapter is the PlaceHolder control. This control is intended to be used as a place holder when you add controls to a Web form at run time, as we'll do in this chapter. Here is the class hierarchy for the PlaceHolder class:
Object Control PlaceHolder
As with the literal control, the PlaceHolder control does not produce any visible output. This control is used only as a container for other controls on the Web page, and especially when you add new controls.
Now it's time to get to the specific case-by-case details on these first Web server controls in the Immediate Solutions section of this chapter. I'll start with an example named Controls that shows how to use many of the properties of Web server controls in general to enable or disable, add tool tips to, or move those controls in a Web form at run time.