by Vahid
3. March 2009 03:54
Web user controls are easy to make, but they can be less convenient to use in advanced scenarios. You develop Web user controls almost exactly the same way that you develop Web Forms pages. Like Web Forms, user controls can be created in the visual designer, they can be written with code separated from the HTML, and they can handle execution events. However, because Web user controls are compiled dynamically at run time they cannot be added to the Toolbox, and they are represented by a simple placeholder glyph when added to a page. This makes Web user controls harder to use if you are accustomed to full Visual Studio .NET design-time support, including the Properties window and Design view previews. Also, the only way to share the user control between applications is to put a separate copy in each application, which takes more maintenance if you make changes to the control.
Web custom controls are compiled code, which makes them easier to use but more difficult to create; Web custom controls must be authored in code. Once you have created the control, however, you can add it to the Toolbox and display it in a visual designer with full Properties window support and all the other design-time features of ASP.NET server controls. In addition, you can install a single copy of the Web custom control in the global assembly cache and share it between applications, which makes maintenance easier.
considering the kind of flexibility we get from web custom controls, i believe most of the times it would be much better to use custom controls.
| Web user controls | Web custom controls |
| Easier to create |
Harder to create |
| Limited support for consumers who use a visual design tool |
Full visual design tool support for consumers |
| A separate copy of the control is required in each application |
Only a single copy of the control is required, in the global assembly cache |
| Cannot be added to the Toolbox in Visual Studio |
Can be added to the Toolbox in Visual Studio |
| Good for static layout |
Good for dynamic layout |
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