http://programminglinq.com/blogs/marcorusso/archive/2007/10/12/vb9-changes-in-nullable-types-conversion.aspxThe Beta 2 of Visual Basic 9 changed the way it handles nullable types conversion. In our Introducing Linq book (based on Beta 1 of Visual Studio 2008) we wrote that it wasn't possible to assign a nullable value to the corresponding non-nullable typeenCommunityServer 2.1 SP2 (Build: 61129.2)