When you call the index method of the IndexingService you can pass a parameter which tells the service whether the index should be reindexed or changes should be appended to the index. Bellow is the implementation of this method:
/// Crates an index for all pages and documents provided by all registered clients
If you wish only to append changes to the index you should use call the Index method passing true as the parameter value.
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!