Left Trigger and Shoot* (to throw it up), Shoot (to dunk it in).
* - Shoot is "X" on an Xbox Controller, if you are using something else you can see the controller settings in advanced controller settings menu.
On Xbox 360 it's LT and B make sure the player is just close enough to the basket. You have to check other platforms because im no sure.
u dont?
a+x
Lt + a
On PS2 it is R2.
if only an alley-oop .. in pc .. press numpad 0 + Shift .
L2+x
Jmup to dde cente l1
to throw a alley-op on nba 2k12 for ps3 is just by pressing L2 and the circle button on your ps3 controller
how to throw an alley hoop dunk in PC games
Left Trigger and A when a player is approaching the basket
To alley oop on NBA 2k13 PC, one needs to accelerate by pressing the forward button until one reaches the basket and then shoot the ball back to another player to score.
hold down b and L