Chapter 14. Custom and User Controls
Chapter 4 includes a chart of the five types of controls supported in ASP.NET: HTML controls, HTML server controls, web server controls, validation controls, and controls created by the developer. This chapter discusses this last type of control, known as custom controls, and a subset of them called user controls.
Of course, all three of these methods, and the three control types that correspond to them, are variations on the same theme. We'll consider these custom controls later in this chapter. The simplest category of custom controls is a subset called user controls. Microsoft distinguishes user controls as a special case because they are quite different from other types of custom controls. In short, user controls are segments of ASP.NET pages that can be reused from within other pages. This is similar to "include files" familiar to ASP developers. However, user controls are far more powerful. User controls support properties and events, and thus provide reusable functionality as well as reusable HTML.