I get this error when I run my .Net application tries to Oracle database on a 64-bit Windows 7 machine. "OCIEnvCreate failed with return code -1 but error message text was not available."
Am using System.data.OracleClient.dll to connect to Oracle db.
Could you please advise?
What version of Oracle client do you have installed? 32 bits or 64 bits?
What bitness is the app? 32 or 64?
Are you able to connect from the same client using SQLPlus?
Is the OracleHome\bin in your PATH environment variable?