I am working on a small project using the new visual C# express and SQL Server Express. Well I just upgraded SQL Server Express to the new beta which meant I needed to upgrade the .NET SDK also so I did. Now that went off perfectly fine everything works except when I went to rebuild my app I got a boat load of compile errors. It seems that my project (something I have been working on and off for a while); had a bunch of references to earlier frameworks. I mean OK no problem let's go fix the issues then I noticed that some of the refernces in the same project were to the right version of the framework and others were to an earlier version. OBoy I do not know how that happened; somewhere the references got lost / mixed up / something. Oh well live and learn.