I can open a connection with SQL Developer but when i do the same with .NET returns me ORA-12514
Your database instance "BDTEST1" will, by default, register service "BDTEST1" in the Oracle Listener. Oracle Listener will expose that SERVICE_NAME. 

Replace SERVICE_NAME=BDTEST with SERVICE_NAME=BDTEST1 for your .NET config and you can connect.

Before you enter the app layer, make sure your connect-string is correct.
use sqlplus or SQL Developer (custom connect):

sqlplus user/pass@\"(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 172.27.32.27)(PORT=1521))(CONNECT_DATA = (SERVER = DEDICATED)(SERVICE_NAME=BDTEST1)))\"


If you connect using the SID the connect-string will be:

sqlplus user/pass@\"(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = 172.27.32.27)(PORT=1521))(CONNECT_DATA = (SERVER = DEDICATED)(SID=BDTEST1)))\"


I think you have to escape the " on Windows...not sure.

Side note: Behind a service there can be multiple oracle database hosts and DR hosts. If you connect using SID, you will always connect to the named instance (SID). If this one is down, no failover can happen. So you better use SERVICE_NAME. Ask you admins to provide it to you.    

Best of luck!