How do you stop a Schnauzer from tugging at his lead?

Every time i put the lead on my Schnauzer, he grabs the lead in his mouth and tugs on it like a toy. i have tried treats, water and commands, but nothing seems to work.

He is 2 years old, very playful, loves children and barks a lot. i just can't seem to calm him down before he goes for a walk, he seems to be so excited to go out that he starts to whine, bark and tug on the lead.

I am afraid that it's going to get worse.

I am not sure how to approach this matter, please could someone help by giving some tips or ideas.