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To test the Web Parts catalog

..........1. Load the page in a browser.

..........2. Click the Display Mode drop-down menu, and select Catalog.

3. The catalog titled Add Web Parts is displayed.

4. Drag the Tree view control from the Main zone back to the top of the Sidebar zone, and drop it there.

5. In the Add Web Parts catalog, select both check boxes, and then select Main from the drop-down list that contains the available zones.

6. Click Add in the catalog. The controls are added to the Main zone. If you want, you can add multiple instances of controls from the catalog to your page.

7. Click the Display Mode drop-down menu, and select Browse. The catalog disappears and the page is refreshed.

First Page: ASP.NET 2.0 Tutorials : Adding Web Parts at Run Time