Actually there was a misunderstanding as I tried it with the VS report designer, where I used a different provided which is registered only for VS and it worked correctly with it. This provided however is not available as generic data provider and therefore is not available in the standalone designer. The SQL CE 4.0 generic provider has a check whether CommandTimeout is always 0, and if not throws the exception you posted. To workaround this problem you would have to manually set:
from the property grid of the SqlDataSource component.
Sorry for the temporary inconvenience.
the Telerik team
BLOGGERS WANTED! Write a review about Telerik Reporting or the new Report Designer, post it on your blog and get a complimentary license for Telerik Reporting. We’ll even promote your blog and help bring you a few fresh readers. Yes, it’s that simple. And it’s free. Get started today >