Running in 64 bit mode with the 32 bit Oracle client installed

I have seen many postings on this issue but none of the suggested solutions have helped me.
I am running visual studio 2010 professional with SP1 on windows 7 64 bit machine. When I try to run a web service locally and call it with SoapUI, I get the following error message during OracleConnection.Open().
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.
I have tried setting up the build configuration and the project settings to target 32 bit but that has not helped. I have also tried removing the reference to System.Data.OracleClient that shows being under Program Files (x86) and add a new reference to the dll under GAC_64. That too did not work.
I only have the 64 bit client installed on my machine.
Any help will be appreciated.
Thank you

1. Visual Studio any version is 32 bit ONLY irrespective of hardware or OS bits. So to DEVELOP with Oracle Client you MUST install 32 bit Oracle ODAC components. Task manager will show devenv.exe *32 (to confirm 32 bit Visual Studio application).
2. You can run your web application inside IIS/IIS Express in your PC which independently can be either 32bit or 64bit. If it is 64 bit, you MUST also install 64 bit Oracle ODAC components which means you'll have to install both 32bit and 64bit in your 64 bit Win7 running on 64bit hardware.
3. In Visual Studio if you compile with "AnyCPU" as target, the resultant binaries (Web/NonWeb) can be both 32bit or 64bit. So if target PC is "AnyCPU" or "x64", you MUST install Oracle ODAC 64 bit in the target OS if that target OS is 64bit. You don't have to install 32bit ODAC in the target PC.
4. One more catch to above scenario is the target OS could be 64bit simulated OS on a 32bit hardware. In such case you MUST install both 32bit and 64bit ODAC components.
So while you ask your network team to download ODP.NET/ODAC Components make sure you ask them to download both 32bit and 64bit. Total nearly 600MB.
Hope this helps many people out there.

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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.

Hello guys,
            Problem has been solved -
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.
1. If you install 64 bit oracle this is not an issue. Install 64 bit oracle.
2. Download odp.net 32 bit from below link:-
    ODP.NET Managed Driver Beta Download</title><meta name="Title" content="ODP.NET Managed Driver B…
3. installed the odp.net.
4. open the visual studio 2010.
5.Select new - project - asp.net web application - project name -ok
6.select tools- > connect to database- then follow the following steps
                         i> user name - your user name/client username (example -- hr)
                         ii> password -- enter your password/client password (example- hr)
                        iii>select connection type -- if you want to connect client database then- select EZ connect other wise select tns
                        iv>test the connection- then you will get connection succeed.
                        v> then click ok
Thanks
Chandrashekhar

You do not need to do anything in VS. You do need to configure both tnsnames.ora files, because the drivers do not share any data.
Please see:
http://sqlblog.com/blogs/jorg_klein/archive/2011/06/09/ssis-connect-to-oracle-on-a-64-bit-machine.aspx

This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed.

hi friends ,
My report Fetch from the orcle database , we installed Oracle 10g and 11g - clent 32 -bit on win 2k8 -64 bit machine .while design time runing fine,but ofter depolyement im facing below issue.
In error has occurred during report processing. (rsProcessingAborted)
The execution failed for the shared data set 'abc'. (rsDataSetExecutionError)
Cannot create a connection to data source ' Data source for shared dataset'. (rsErrorOpeningConnection)
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.
An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)
Any help is greatly appreciated, I have tried couple of solutions going through some threads online but no use and place dt tell install 1og r 11g 64-bit

Hi,
Based on the error message, we should confirm whether Oracle client tool has been installed on the Report Server at the beginning. If the Report Server installed is 64-bit, we should also install a 64-bit Oracle client tool on the Report Server. Besides, we
can also try to bypass tnsnames.ora file when connecting to Oracle by specifying all the information in the data source instead of using the TNS alias to connect
to the Oracle database. Please see the sample below:
Data Source=(DESCRIPTION=(CID=GTU_APP)(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST= server01.mydomain.com)(PORT=1521)))(CONNECT_DATA=(SID=OracleDB)(SERVER=DEDICATED)));
Reference:http://blogs.msdn.com/b/dataaccesstechnologies/archive/2010/06/30/ora-12154-tns-could-not-resolve-the-connect-identifier-specified-error-while-creating-a-linked-server-to-oracle.aspx
Hope this helps.
Regards,
Heidi Duan
Heidi Duan
TechNet Community Support

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Running in 64 bit mode with the 32 bit Oracle client installed

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