Report displays correctly in report designer, but displays no data when presented through the web viewer

My report is written in Crystal Reports for VS 2010 using c#.net. Its using the CR web viewer.

It displays everything correctly in VS and whilst testing it on IIS7 (locally) using the web viewer.开发者_JS百科

When I print or export the report (from the web viewer) all the 'fixed' fields (labels, text fields, images etc.) are printed but all the 'data' fields are not printed, just blank.

Have I missed a setting somewhere that allows the data in the report to persist?

Sounds like you might need to select Save Data with Report, which is on the File menu in Report Designer.

Looks like the reportdocument wasn't being saved to the session and restored correctly on a postback event. Modified a few bits and pieces and now its working like a charm.