Who plays the voice of Dobby the House-elf?

In Harry Potter and the Philosopher's (Sorcerer's) Stoneand Harry Potter and the Chamber of Secrets, Albus Dumbledore was played by Richard Harris. Harris passed away before filming began on Harry Potter and the Prisoner of Azkaban, so they recast Michael Gambon, who ultimately played Dumbledore in the rest of the films.

Toby Regbo played a young Dumbledore in Harry Potter and the Deathly Hallows Part One.