DataReader returns no rows — rows are present in database?

I think you need to remove the cmd.Parameters. Add(param) call. That adds a new parameter on each iteration.

It should be sufficient to just set the parameter value each time for the existing parameter.

You are currently re-adding the parameter for every artist - I'm surprised that this works at all, certainly it shouldn't for SqlParameter - if DbParameter works the same way it should be like this.

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