Of course! And not just simply "swinging"...but "jumping" an EHC against the current -which requires some practice- is absolutelly deadly when nothing works. I got strikes of big browns lying on the depth or behind bouldes, previously trying to fool them with another flies or on dead drift dries. A walked-and jumping caddis imitation with short strips against the current is in my experience, the most successful way to work a dry fly. Good luck!