mogaka 0 Light Poster

have been creating reports using crystal report and crystal report viewer. but i want now to generate them from sql databse using reportviewer. my report does not display any record.
for a crystal report, to load data, the code is for example:
dim myreport as new crystalreport1
crystalreportviewer1.reportsource=myreport
crystalreportviewer1.refresh
and get data displayed on the crystalreportviewer
what about reportviewer ?