ASP.NET/C# connect to Oracle DB

Question

I need to access a view on an oracle server with an ASP.NET website. It works if I debug the website through visual studio(press F5 in VS2012), but when I go to the version hosted on my local IIS (LocalHost/) I get this error:

Oracle.DataAccess.Client.OracleException: ORA-12154: TNS:could not resolve the connect identifier specified

A lot of the information I'm finding is related to the deprecated System.Data.OracleClient and I'm using Oracle.DataAccess.dll File version 4.112.3.0, Assembly version 2.112.3.0.

I set the AppPool it's running in to Enable 32-Bit Application=True based on some other people with a similar issue, I think everything else is default settings.

I've tried using the gacutil to make sure it is installed in the gac.

I also made a small winForms application that works and can access the data.

I've tried a couple connection strings:

This one works:

"Data Source=SOURCE;Persist Security Info=True;Password=****;User Id=****;"

This one doesn't work, I can't figure out a valid SERVICE_NAME :

"user id=****;password=****;data source=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=****)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=****)));"

I always get this error:

Oracle.DataAccess.Client.OracleException: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Places I've looked for SERVICE_NAME

I checked the connection I was able to establish with the first connection string and the SERVICE_NAME was either blank or sys$users depending on the query I ran.

I found three files named tnsnames.ora ; one was completely blank, the SERVICE_NAME in the other two were Worker and <database service name> .

NOTE: I don't have access to the server, just credentials for this one view.

Answer 1

I found the SERVICE_NAME with this: select sys_context('userenv','db_name') from dual; and used the second connection string from the question:

"user id=****;password=****;data source=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=****)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=****)));"

Thanks for all the help.