How to solve "ORA-12514: TNS:listener does not currently know of service requested in connect descriptor" error?

I am trying to create connection with the database for debugging ASP.Net website. Database is 11g Oracle DB... There is no problem when I connect using SQL Developer, however using Visual Studio I get the error of ORA-12514 (TNS:listener does not currently know of service requested in connect descriptor). 11g ODAC for Visual Studio 2010 has been configured as well. There are similar questions about this error, I could not find solution for my problem.

Thanks in advance for the help!!!