Trouble in a minimal application : Can't Connect, worthless Exceptions

Hi all,
I have tried to connect to an oracle db from within an app i maintain. since i had trouble doing so, I isolated the connection into an app of its own, in order to debug it.
It's a windows form in C#, and here's the source (and that really IS all!)
InitializeComponent();
OracleConnection conn = new OracleConnection("Data
Source=TEST.Provider;User Id=TestUser;Password=TestPass;");
try
conn.Open();
catch (OracleException e)
Console.Out.WriteLine("holy cow");
I tried the connectionString (which is non-breaking, the forum's textarea wraps it up) in another application, and it works.
the stack trace doesn't give me any useful hints :
bei Oracle.DataAccess.Client.OracleException.HandleErrorHelper(Int32 errCode, OracleConnection conn, IntPtr opsErrCtx, OpoSqlValCtx* pOpoSqlValCtx, Object src, String procedure)
bei Oracle.DataAccess.Client.OracleConnection.Open()
bei WindowsApplication2.Form1..ctor() in C:\profiles\sebi\Eigene Dateien\Visual Studio 2005\Projects\WindowsApplication2\WindowsApplication2\Form1.cs:Zeile 18.
By the way, I use Oracle.Access.Client from the Oracle DP10g Data Access Assembly.
I'm a bit stuck here, after 3 hours of not getting it to work....Can anyone help me please?

Hi,
This machine has several things installed, yes. In the installed Software list i can find OracleClient version 9.0.
In my application, I use an DP10g assembly (Oracle.DataAccess.Client)
How can I check on ODP?

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