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I believe there are two versions 1 and 2? And version 2 is referred to as Entity Framework 4.0?
How can I tell what version is being used in an application?
This is in my web.config does this mean I am using version 2?
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
There are two versions: 1 and 4. EFv4 is part of .net 4.0, and EFv1 is part of .net 3.5 SP1.
Yes, the config setting above points to EFv4 / .net 4.0.
EDIT
If you open the references folder and locate
system.data.entity, click the item, then check the runtime version number in the Properties explorer, you will see the sub version as well. Mine for instance shows runtime version v4.0.30319 with the Version property showing 4.0.0.0. TheEntityFramework.dllcan be viewed in this fashion also. Only the Version will be 4.1.0.0 and the Runtime version will be v4.0.30319 which specifies it is a .NET 4 component. Alternatively, you can open the file location as listed in the Path property and right-click the component in question, choose properties, then choose the details tab and view the product version.