Thank you. I have been having the same problems and the line which reads: CompilerOptions='/R:"C:\Program Files\Microsoft.NET\OracleClient.Net\System.Data.OracleClient.dll"' has finally enabled me to successfully connect to oracle. Having said this, I would like my connection information in a code behind .vb page. How do I the above line inside a .vb page? Any advice would be greatly appreciated.