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Problem: Someone has a form which has a panel which swaps in and out. When swapping panels, Controls.Clear() is used to clear off the old panel.

This is inefficient as it:

Forces a layout - the Panels parent is set to null, which causes a ParentChanged, which results in a layout

Leaks resources as the Panel is no longer associated with the form and will hold open USER32 handles.

Solution: There are a couple of solutions, depending if youre done with the panel or not.

If youre not done with the panel just set it to be Visible=false

If youre done with the panel call dispose on it.