oh!.... Ciggy don't take it seriously! :D

my problem is solved. what i did.
1. synced my phone with my pc for taking back up of contacts.
2. deleted all the contacts from my phone.
3. then again synced and taken back all the contacts in Phone......

and then Boom boom boom.... it worked..... now i can see caller name when i receive call from in Contact.

Thanks every one..... for replaying. :)