Oracle TNS names configuration

I've edited added new TNS name to tnsnames.ora.
Toad for Oracle started to work at once. SQL Plus doesn't work even after logoff/logon, the same problem with my build scripts.

Getting the error: ORA-12154: TNS:could not resolve the connect identifier specified

How could I fix it?

There are various methods of achieving this ,one of them as suggested by Yasir.
Please follow the below steps:

• Close toad/sqlplus

• Create a folder TNS_ADMIN

• Add tnsnames.ora in TNS_ADMIN

• Add TNS_ADMIN in enviornment variable.

• Open Toad/Sqlplus and login

I think this will be very clear ,cheer

StackExchange Database Administrators Q#42196, answer score: 7