Nobody actually betrayed them, it was a plan of Dumbledore's and Snape that Snape would tell Voldemort the time and date the Order would depart with Harry. The only "betrayal" that occured was that Mundungus Fletcher disapparated when he saw Voldemort flying after him.
Deathly Hallows is the most recent and is number seven in the series. Order of the Phoenix was the fifth in the series.
Harry Potter and the Order of the Phoenix (2007)$4,000,000 Harry Potter and the Deathly Hallows: Part 1 (2010)$15,000,000 Harry Potter and the Deathly Hallows: Part 2 (2011) $15,000,000
The order of the Phoenix
well, the deathly hallows was split into two movies so that leads to suggest that deathly hallows is longer. However, if you compare the pages of the books it is really close, with Order of the Pheonix being slightly longer.
You must complete the first two storylines in the game in order to play the deathly hallows storyline. Therefore you must complete the order of the phoenix and the half blood-prince.
Harry Potter and the Order of the Phoenix won.
Chamber of secrets, Half-blood prince, Deathly hallows, Order of the pheonix, Sorcerers stone, Goblet of Fire, Prisoner of azkaban Another Opinion Prisoner of Azkaban Deathly Hallows Part 2 Order of the Phoenix Deathly Hallows Part 1 Chamber of Secrets Philosopher's Stone/Sorcerer's Stone Goblet of Fire Half-Blood Prince
She appears in four of the films:Harry Potter and the Order of the PhoenixHarry Potter and the Half-Blood PrinceHarry Potter and the Deathly Hallows Part OneHarry Potter and the Deathly Hallows Part Two
Harry Potter and the Deathly Hallows part 2 comes out on DVD and Blu-ray on 2nd December, 2011 in the UK. Not sure about other countries. But you can pre-order now from HMV :)
She is in Order of the Phoenix, Half Blood Princeand Deathly Hallows (both parts).
Adrian Rawlins: Harry Potter and the Philosopher's Stone, Harry Potter and the Goblet of Fire, and Harry Potter and the Deathly Hallows. Robbie Jarvis: Order of the Phoenix (Teenager) Unknown: Deathly Hallows Part 2
Any good bookstore. If your really stuck you can order them from places such as Amazon.