Can I Sell Ipad 2 64 GB Locked To a Store or No

Nobody else will be able to use the iPad until you've removed it from your account, only you can remove a device from your account.

If you can't remember your id then do you have any of its purchases in your computer's iTunes library : Recovering a forgotten iTunes Store account name ?

If not then see if you can get the id via http://appleid.apple.com : Apple ID: How to find your Apple ID

You've tried each of your email addresses (you don't have any email receipts for your purchases ?) to see if you can reset the password for them : http://iforgot.apple.com ? And have you tried the 'Find your Apple id' link on http://appleid.apple.com ?

Unless you can get your id, and its password reset, then nobody will be able to use the iPad - you are the only person that can remove it from your account.

If you don't take that off you're selling them a worthless brick. Would you buy a worthless brick?