User Controls vs. Other Controls

User Controls vs. Other Controls in ASP.NET

One source of confusion when working with ASP.NET is knowing the difference between the many different types of controls out there and what they should be called. Microsoft has attempted to distinguish this variety, but myriad names still exist for elements that have only subtle differences. For instance, an ASP.NET control (sometimes called a server control) is a server-side component that is shipped with .NET Framework. A server control is a compiled DLL file and cannot be edited. It can, however, be manipulated through its public properties at design-time or runtime. It is possible to build a custom server control (sometimes called a custom control or composite control). (We will build these in part 2 of this article.)

In contrast, a user control will consist of previously built server controls (called constituent controls when used within a user control). It has an interface that can be completely edited and changed. It can be manipulated at design-time and runtime via properties that you are responsible for creating. While there will be a multitude of controls for every possible function built by third-party vendors for ASP.NET, they will exist in the form of compiled server controls, as mentioned above. Custom server controls may be the .NET answer to ActiveX Web controls.


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