I get the following message when I try to add an ADO.net Data Service to my web project:

"Cannot find assembly 'System.Data.Entity'."

I installed:

• Visual Studio Team System 2008 (Development Edition)
• ASP.net 3.5 Extensions CTP
• ADO.net Entity Framework 1.0 (Pre-Release Version)
• ADO.net Entity Framework Tools Preview

Another interesting detail is that I have the following xml files in my "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5" but no corresponding DLLs:

• System.Data.Entity.xml
• System.Data.Entity.Design.xml

Any help would be very much appreciated.

 Pyt

I actually managed to fix the issue by copying the following files in my "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5" folder:

• c:\Windows\assembly\GAC_MSIL\System.Data.Entity.Design\3.5.0.0__b77a5c561934e089\System.Data.Entity.Design.dll
• c:\Windows\assembly\GAC_MSIL\System.Data.Entity\3.5.0.0__b77a5c561934e089\System.Data.Entity.dll

It's still weird, could it be a problem with the installer? I have an x64 machine running vista.

Have you Installed framework 3.5 sp 1.0

Yes this issue can be resolved if you have Microsoft .Net Framework 3.5 SP1 installed.Check this out.It will surely solve your problem!!

Happy Coding....