Caching data in autocompleteextender

I would like to know how does autocompleteextender retrieve data using webservice. Does it re-call webservice each time new letter is typed or the webservice is called once on control load, and then the subset is parsed on each letter change using the giv开发者_StackOverflow中文版en match.

Thanks

The AutoCompleteExtender has a setting called EnableCaching that is default on. When leaving this on, it is caching the searches, and if a search is done previously, it does not call the web service but retrieves the list from clent side cache.

I am pretty sure it hits the web service repeatedly.

As an aside: I would consider using the jquery autocomplete plugin and and an asp.net handler instead.

This has an API for client side caching, and much better control over the CSS emitted.