Databases :: Config When Accessing Oracle?

VB.NET 2.0, windows forms applications. I have two applications, A and B. A accesses a remote Oracle database already, B needs to access a different database, but also Oracle, from the same outside source.So, I thought it would be easy; copy code to connect, change the query, and off we go. But I keep getting the old ORA-12154 error that it can't resolve the connect identifier.First, I developed the query usng sql plus connecting to the target database. So, I know the machine has appropriate entries in tnsnames.ora.Second, I cut-and-pasted the block of code from B into A and gave A a test. It successfully connects and runs the query. So, I know that the data source, user id, password and sql are o.k.Third, I looked in the registry (HKEY_LOCAL_MACHINESOFTWAREOracle) and found the all ORACLE_HOME paths that were set up. Went down all those paths to insure the tnsnames file had my new connection defined.Fourth, I'm able to find the database B is trying to get to via tnsping from the command prompt.Fifth, I copied the connection string from A to B, just to see if it could connect to the database A is known to connect to. Same exception.So, everything connects everywhere except B, who cannot get to Oracle at all. I just can't find what's telling B to use a different tnsnames file (maybe?).Missing something obvious, no doubt.[Edit]I realized overnight I hadn't shown how I was connecting. (The exception is thrown trying to open the connection.) Pretty simple:

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