The following link states it is the following..
But that has an error at .Data.. Trying to hand type it, the intellasense says there is no .Data as a choice.. Neither did I see any other winning combos.. Except For system.IO and it doesn't work by itself and after system.IO the only next step in system.IO.Compression (which isn't it)..
Also opp. clicking on the error for SQLConnection or SQLCommand brings up no "Resolve" help where it will just add the Reference needed..