[c#] There is already an open DataReader associated with this Command which must be closed first

I had the same error, when I tried to update some records within read loop. I've tried the most voted answer MultipleActiveResultSets=true and found, that it's just workaround to get the next error 

New transaction is not allowed because there are other threads running in the session

The best approach, that will work for huge ResultSets is to use chunks and open separate context for each chunk as described in  SqlException from Entity Framework - New transaction is not allowed because there are other threads running in the session

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