Have you tried a reset to see if it charges after the iPad has restarted ? Press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.
@jstoes, please confirm you are trying to charge the iPad using the included 10Watt wall charger. The iPad battery needs to be able to pull the full 10 watts to charge which is why when you try to use an iPod/iPhone 5 watt charger it wont charge and why when you try to plug the sync/dock cable into the USB port on a laptop the iPad won't charge. Neither of these options will work because neither of them provides enough juice to get the circuits in the iPad to start charging the battery. Plugging the iPad into an iPhone/iPod charger will eventually charge it but it will take literally days and the wall charger will get really really hot because the iPad is trying to pull so much wattage through it.
But if you are using the right charger and you have done the reset King_Penguin mentioned and you still cannot get the iPad to charge you could have a hardware problem. Is it is hardware you will need to take to to an Apple store and have someone at the Genius bar to look it over. Since you bought it in March it should be under warranty (assuming you bought it new) and they should replace it for you.
The quickest way (and really the only way) to charge your iPad is with the included 10W USB Power Adapter. iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter (5W). When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge very slowly (but iPad indicates not charging). Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain.
Apple recommends that once a month you let the iPad fully discharge & then recharge to 100%.
How to Calibrate Your Mac, iPhone, or iPad Battery
At this link http://www.tomshardware.com/reviews/galaxy-tab-android-tablet,3014-11.html , tests show that the iPad 2 battery (25 watt-hours) will charge to 90% in 3 hours 1 minute. It will charge to 100% in 4 hours 2 minutes. The new iPad has a larger capacity battery (42 watt-hours), so using the 10W charger will obviously take longer. If you are using your iPad while charging, it will take even longer. It's best to turn your new iPad OFF and charge over night. Also look at The iPad's charging challenge explained http://www.macworld.com/article/1150356/ipadcharging.html
Also, if you have a 3rd generation iPad, look at
Apple: iPad Battery Nothing to Get Charged Up About
Apple Explains New iPad's Continued Charging Beyond 100% Battery Level
New iPad Takes Much Longer to Charge Than iPad 2
Apple Batteries - iPad http://www.apple.com/batteries/ipad.html
Extend iPad Battery Life (Look at pjl123 comment)
New iPad Slow to Recharge, Barely Charges During Use
Tips About Charging for New iPad 3
Prolong battery lifespan for iPad / iPad 2 / iPad 3: charging tips
iPhone, iPod, Using the iPad Charger
Install and use Battery Doctor HD
In rare instances when using the Camera Connection Kit, you may notice that iPad does not charge after using the Camera Connection Kit. Disconnecting and reconnecting the iPad from the charger will resolve this issue.
Currently Being ModeratedAug 29, 2012 6:09 PM (in response to King_Penguin)
Yes I think I have to take it to the apple store....I am Using the plug it came with and the battery icon does not show a charge at all....thanks for the help and apple is the next steps I think....