The download of sample code for the Feb 2007 Datapoints article is missing the MSDN200702-Bound_BL project. I tried downloading both the full magazine sample code and just the Datapoints sample code, but both suffer from the same problem. Here's the XML from file MSDN200702-Bound.sln that illustrates the problem. The first project exists, but the second one does not: Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MSDN200702-Bound", "MSDN200702-Bound\MSDN200702-Bound.csproj", "{CE6A63E3-AFEE-4E4F-B326-A363BC39060B}" EndProject Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MSDN200702-Bound_BL", "MSDN200702-Bound_BL\MSDN200702-Bound_BL.csproj", "{D35FFC5A-1FC5-427F-8BEB-B180918A0051}" EndProject