I have installed Oracle 11g r1 64 bit on Windows 7. I am able to connect to it using Sql Developer and a command line tool written in .Net that is 32 bit. I am using Visual Studio to create an ASP.Net application. The solution has 4 projects all of which are compiling for "Any CPU" I installed the 64 bit version of Oracle client and I keep getting the error below. The project is using the System.Data.OracleClient provider. Everything is 64 bit so I don't know why I am getting the error.
[InvalidOperationException: Attempt to load Oracle client libraries threw BadImageFormatException. This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed.]
Best Answer
What version of ORacle.DataAccess do you have installed ? Check the GAC:
gacutil /l Oracle.DataAccessMake sure you have the 64 bit version installed. Also make sure you don't have the 32bit Oracle client on your path before 64 bit client.
I found last week that installing the 32bit Oracle ODP.NET package removes the 64 bit publisher policies...