Creating an extreme powerful control that is composite custom control which requires the combination of several server or HTML controls with in a single control class, and which can compiled with other control classes to create an assembly. That created assembly (.dll) contains custom control library. After creating, you can load into Visual Studio .NET and can use as how you are using standard controls.
These controls are functionally similar to user controls, but they present in their own assemblies, so you can share the same control in different projects without copying the control. However it’s difficult to create custom controls because you can’t draw them visually with the help of Visual Studio .NET.
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