How to add an object that is attached to an ObjectContext, to an EntityCollection that is not associated with a source object?

You can't attach entities to a different context when they are attached to a different one. You need to detach it from the previous one if you relay want to do it msdn.microsoft.com/en-us/library/bb89627....

You can't attach entities to a different context when they are attached to a different one. You need to detach it from the previous one if you relay want to do it. msdn.microsoft.com/en-us/library/bb89627....

I tried query.ToList. Foreach(q => db. Detach(q)); And I get this error: System.

InvalidOperationException: The object cannot be detached because it is not attached to the ObjectStateManager. – Nanek Jul 7 at 9:44.

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