Designing a User Control
A user control is technically the same as any other class that you author as a developer. Because a user control has a visual aspect to it, Visual Studio provides a designer, just as with Windows Forms, to help in the drag-and-drop creation of the control.
User controls are composite controls; that is, they are constructed from one or more existing .NET controls. As with a derived control, their user interfaces inherit from the native controls they are composed of, making them simple to build and use in the designer.
There are two approaches to the user control creation process: you can create a separate Windows Control Library project, or you can simply add a user control class to an existing Windows Forms project.
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