>private System.Data.OracleClient.OracleDataAdapter oracleDataAdapter1;
>
>Is that sufficient, or do I still need a 'using' statement at the top of my source file?

That's sufficient, but you'll have to use the full namespace ref on every type you create.

Are you sure that System.Data.OracleClient doesn't work? Make sure you add the DLL to the references dialog to.