The Form Layout control simplifies the manner in which you create ASP.NET applications in Visual Studio. It allows you to quickly create form layouts of any complexity by combining the order and hierarchy of the control's layout elements.
The Page Control displays content as a set of tabbed pages. Each page in the Page Control serves as a separate child control container allowing you to associate specific page content with each displayed tab.
The Popup Control provides the ability to create and use a number of popup windows in your web application. Popup windows are a special type of overlapped temporary window that appear separately from an application's main window, and are typically used to display quick reference information.