Use multiple business objects in RDLC reports

Hi All

I am hoping that someone can point me in the right direction. I am very new to RDLC and reporting in general. I have worked through a number of tutorials using Business objects and RDLC - sadly they all seem to be simple in nature.

Question 1 - Are there any tutorials/walkthrough that cover creating RDLC's with multiple business objects?

It would seem that to add further Business objects you create them in their own DataSet?
Is this correct?

withing a tablix on the report I have used expresions to model the data from the 2nd Dataset - no errors on build - but no data shown
e.g

=Sum(Fields!GroupSales.Value, "DataSet2")

Question 2 How are all these fancy reports generated - do they gather all the data into a single table and then display and manipulate it in the report? (if this is so - it seems to go against separation of concern models that we are encouraged to follow)

Many thanks in advance on any help and pointers with the above

Regards,
Steve

Tags: C#, Windows Forms, RDLC