Architecture and Design of Windows Forms Custom Controls—What Is a Custom Control?

Microsoft .NET Framework, ASP.NET, Visual C# (CSharp, C Sharp, C-Sharp) Developer Training, Visual Studio

What Is a Custom Control?

Custom controls are components that have a visual aspect to them, will be part of the user interface, and will be configured in the Design window. In effect, custom controls are components with additional responsibilities. All custom controls are components, but the reverse is not true.

You can create three basic types of custom controls: one built from scratch, one derived from an existing control, and one that is a composite of existing controls.