Lpc2000

I know this is kinda off topic, but I'm having problems controlling a
solenoid.  I want to use a gpio pin to simply turn the solenoid on and
off.  I used a NPN transistor in series with the solenoid to control
it, but the solenoid only has around 2 ohms resistance and the
internal resistance of the transistor must be much higher because most
of the voltage is droped across the transistor instead of the
solenoid.  Could someone recomend a better solution to this problem or
suggest a good place on the web to find info.

Thanks