The same day VS2008 was released, Microsoft released also a training kit with 120Mb of PPT, demos and code samples. Among the many demos there is one about the new features of ASP.NET introduced with the framework 3.5: LinqDataSource, DataPager, and ListView. But the code for the sample on the ListView contains an error, probably because it was developed with the beta2, and it happens that the RTM has a breaking change on this. With Beta2 you could do (warning, this won't work with VS2008 RTM): <asp:ListView ID="ListView1"...