WHich is it - you can't connect to iTunes on your computer or can't connect to iTunes store?
iPad not appearing in iTunes
http://www.apple.com/support/ipad/assistant/itunes/
iOS: Device not recognized in iTunes for Mac OS X
http://support.apple.com/kb/TS1591
iOS: Device not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
IOS: Syncing with iTunes
http://support.apple.com/kb/HT1386
Apple - Support - iPad - Syncing
http://www.apple.com/support/ipad/syncing/
iTunes 10.5 and later: Troubleshooting iTunes Wi-Fi Syncing
http://support.apple.com/kb/ts4062
The Complete Guide to Using the iTunes Store
http://www.ilounge.com/index.php/articles/comments/the-complete-guide-to-using-t he-itunes-store/
Can't connect to the iTunes Store
http://support.apple.com/kb/TS1368
iTunes: Advanced iTunes Store troubleshooting
http://support.apple.com/kb/TS3297
Best Fixes for ‘Cannot Connect to iTunes Store’ Errors
http://ipadinsight.com/ipad-tips-tricks/best-fixes-for-cannot-connect-to-itunes- store-errors/
Try this first - Reset the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.
This works for some users. Not sure why.
Go to Settings>General>Date and Time> Set Automatically>Off. Set the date ahead by about a year.Then see if you can connect to the store.
Cheers, Tom 😉