Zoom to the maximum extent

Question

I am using ArcGIS 9.3. When I perform a search and draw the returned features on the map, I need it to be zoomed to the maximum possible extent that includes all features. Is this possible? Any examples appreciated.

SamLaker · Answer

Thanks for your response.
I found the exact solution I was looking for here. 
http://forums.esri.com/Thread.asp?c=158&f=2396&t=267827

HemingZhu · Answer

Thanks, but in my case, I have multiple layers. This way I can only change the extent of the base layer. But my features are on another layer. (Both served in one map service though). How can I handle this scenario?

Extent.union(extent).

SamLaker · Answer

Thanks, but in my case, I have multiple layers. This way I can only change the extent of the base layer. But my features are on another layer. (Both served in one map service though). How can I handle this scenario?