System.ArgumentException: The version of SQL Server in use does not support datatype 'datetime2'.

It turns out that Entity Framework 4 somehow got the idea to use SQL Server 2008. The fix was to edit the .edmx file in an XML editor and set the ProviderManifestToken="2005" instead of 2008. (You need to rebuild.)

asp.net checkbox modalpopupextender checkbox doesn't check or uncheck

Answer Link:  http://forums.asp.net/p/1072619/1568169.aspx
http://wyerarch.blogspot.in/2010/04/aspnet-checkbox-modalpopupextender.html