RIA Services will handle this for you out of the box when you submit the changes via a domain context or a DomainDataSource.
Here are some link that you may find useful:
- Mike Taulty's series about Silverlight and RIA Services - Part 1 and Part 2.
- RIA Services examples on MSDN here.
Hope this help,
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.