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I have a relatively simple setup. I have a custom usercontrol that has a bunch of components on it, some text boxes, and a listview.
In the designer, I can drag and drop other controls into my usercontrol, and it adds them to the usercontrol instance. I don’t want this.
How can I explicitly say “Don’t allow additional controls to be added to this usercontrol?”
That’s not the way it works. When you drop your user control on a form then adding controls to it isn’t supported. That requires a special designer, this answer shows what is required. Maybe it looks like the controls get added but they merely overlap your user control. Their parent is still the form.
If a programmer opens your user control class itself in the designer then, sure, he can add controls as he pleases. The only way to stop that is to not ship the source code and use the sealed keyword to prevent deriving from it.