Oracle environment variable tns_admin instead tnsnames.ora

Hi, I have a big trouble with the tns_name file. First of all I am working oracle with visual studio .net. I have the file tns_name in the following route C:\oracle\ora92\network\ADMIN\tnsnames.ora. If I delete this file, visual studio .net can still work properly. Then I figured out that it is taking the tnsnames from tns_admin in environment variables. It means visual studio .net is taking the tnsnames from tns_admin instead of C:\oracle\ora92\network\ADMIN\tnsnames.ora.
Can someone explain me why and how is the way to configure which file is used? Where can I configure it?
Thanks in advance.

it throws the following error: ora-12154 tns could not resolveORA-12154 ALWAYS only occurs on SQL Client & no SQL*Net packets ever leave client system
ORA-12154 occurs when client requests a connection to some DB server system using some connection string.
The lookup operation fails because the name provided can NOT be resolved to any remote DB.
The analogous operation would be when you wanted to call somebody, but could not find their name in any phonebook.
The most frequent cause for the ORA-12154 error is when the connection alias can not be found in tnsnames.ora.
The lookup operation of the alias can be impacted by the contents of the sqlnet.ora file; specifically DOMAIN entry.

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Oracle environment variable tns_admin instead tnsnames.ora

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