I have some RDL that was written using the Business Intelligence Design Studio (BIDS) in Visual Studio 2005. This report has a subreport that is visible depending upon a value in the dataset that is the source for the reports data. I have an expression in the hidden property for the subreport that returns true or false depending upon the value. The expression is like =iif(Fields!ShowSubreport.Value = 0, False, True). Anyway everything works fine in Visual Studio 2005. However, I am trying to get this report to work with VS 2008. It is my understanding that when I open this report using BIDS in VS 2008 that it will automatically convert the RDL from 2005 to 2008. It does this this changing my Lists to Tablix and other things. However, when I view the report now, I cannot see the data in the main body of the report. But if I get rid of the expression if the hidden property of the subreport, I can see everything just fine. For example, if I change the hidden property from the expression above to ‘False’ it works just fine. I have tried several different ways of writing the expression, but nothing seems to work. Does anyone know what could be causing this?