How Much Yelling?

Lilly

No matter what I do, most of the time my son doesn't respond except when I yell. When he is doing something he's not supposed to I will tell him to stop several times, redirect him to something else, I keep trying and trying but the other thing he seems to respond to is yelling. I am not normally a yeller so I feel bad when it happens. What are you guys doing when your little one just won't listen?