CatalogZone is enabled for a user to add new web parts - ASP.NET Introduction
Q. What component do you need to enable for a user to add new web parts?- Published on 19 Oct 15a. WebpartZone
b. CatalogZone
c. WebPartManager
d. WebManager
ANSWER: CatalogZone
CatalogZone control is required to add new web parts. This control is works like a container for other controls. CatalogPart control can be added on CatalogZone only.