I had a manager who made a practice of thanking people when they did things he had asked them to. I hadn't seen it done that assiduously before, and I rather g

I had a manager who made a practice of thanking people when they did things he had asked them to. I hadn't seen it done that assiduously before, and I rather got to like it. I try to do the same now, when appropriate. I agree, though, that pre-thanking someone before they've done what you ask is presumptuous.