I'm using data extension and I'mmigrating to VS2010. I've just tested the assemblies targeting .NET 4.0 and when I run a report it tells me this is not supported. I've had to target .NET 2.0. What do I need to do to able to keep the assemblies as .NET 4.0 and have the report serve run reports that use these data extension assemblies? Regards Mike

Mike I have 4.0 and run SSRS 2005 developed in 2.0,3.0 without problemsBest Regards, Uri Dimant SQL Server MVP http://dimantdatabasesolutions.blogspot.com/ http://sqlblog.com/blogs/uri_dimant/