Hello,
I have a SQLCe database which had a unique primary key Id with type uniqueidentifier, and child relationship, 1 to many, where i keep the master id in a column and append unique id for every row too. Now I use POCO entities for my domain model NOT STE. While adding and modifying entities works OK, I have hard time to delete, say for now individual child records, where of course supposed that they have they're own primary key. Soon as i give the deleted list and iterate through each entity while first entity is attached, in the second i get the exception:
An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.
I should mention that i first make any add and modify entities to the database while opening a context...disposing and call another method for deletion where of course opens another context and if it ends successfully disposing.
Whats the meaning for this exception that I don't get?