Can't add reference to Oracle.DataAccess in VS2008 project on Windows XP

I'm experiencing a very frustrating problem that I'm hoping someone can help me with. Originally ODP.NET was installed on my system with the Oracle Express Client. In VS2008 I could add a reference to Oracle.DataAccess using the .NET tab of the Add Reference dialog. Things worked great.
Unfortunately, everyone else on our development team installed ODP.NET using the latest ODTwithOCAC1020221.exe file. Since we are all working on a shared project they would have to update the reference on their machine, and every time I checked out the latest version of the project from our TFS server, I'd have to update the reference. Total pain . . .
So I uninstalled the Oracle Express Client on my system and installed ODP.NET using the same executable everyone else used. The problem I have now is that Oracle.DataAccess no longer shows up as a choice under the .NET tab of the Add Reference dialog.
I have verified that Oracle.DataAccess is in the GAC. I have also manually run gacutil to make sure it was installed without any problems. But no joy, it just doesn't show up in the dialog box to allow me to add it.
Any suggestions?

Yes, I know I can set a reference to it via the file system. The problem comes in somewhere in the unit tests. Even though the reference is there and everything compiles, the unit tests fails because they can't find the reference in the GAC.
Originally when I had the express client installed I was able to add a reference to it using the .NET tab of the Add Reference dialog box in VS2008. After uninstalling the express client and installing the latest version it no longer shows up under the .NET tab which tells me that VS2008 doesn't see it in the GAC. Even though it is there.
It's in the GAC. I can open the assemblies folder on my system and see it in the GAC. I can use gacutil to remove it and reinstall it without any problems. I can create a file reference to it by browsing to the installed location of the dll. But because VS2008 doesn't recognize it in the GAC, my unit tests never find it.
This is very frustrating. My work around for now is to use the MS Oracle driver.

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Ok -
In development I installed "ODAC Entity Framework and LINQ Beta (11.2.0.2.30)" so that we could have a 32 bit version of Oracle.DataAccess for ODP.Net.
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to the assembly in the web.config.
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<add assembly="Oracle.DataAccess, Version=4.112.2.30, Culture=neutral, PublicKeyToken=89B483F429C47342" />
on production to the versioin installed on prod.
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System.IO.FileLoadException: Could not load file or assembly 'Oracle.DataAccess, Version=4.112.2.30, Culture=neutral, PublicKeyToken=89b483f429c47342' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
Actually this is if I move the new dll into the applicaitons bin directory.
If I remove the dll from the directory I get:
Could not load file or assembly 'Oracle.DataAccess, Version=4.112.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342' or one of its dependencies. The system cannot find the file specified.
So I put the line back in.
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That makes sense. The 64 bit XCopy version is an earlier build then the 32 bit Beta that comes with Entity Framework and LINQ(Version=4.112.2.30).
So on production I change the Version attribute to: 4.112.2.0.
But now I get the same error:
System.IO.FileLoadException: Could not load file or assembly 'Oracle.DataAccess, Version=4.112.2.30, Culture=neutral, PublicKeyToken=89b483f429c47342' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
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It's still looking for the same version of the assembly. Why is it doing that?
The web.config has a connection string with the ODP.Net provider type (Oracle.DataAccess.Client).
Which would take from the assembly reference.
It should not care what the version number is.
Could there be something in code somewhere that is specifically looking for the old dev box version?
Just what is the way to make it use the new assembly?
I would think the system would just know where to find the new dll.
Just as in development the add reference dialog knew that the dll was in c:\oracle\... rather then c:\program files(x86)... like out-of-the-box Microsoft assemblies. Because the system knows, right?
Edited by: 842453 on Mar 7, 2011 1:17 PM

Hi,
The .NET runtime will always attempt to load the exact version of the ODP assembly that the application was compiled with unless you have some sort of binding redirection in place. We do provide forward redirection in the way of publisher policy files but we do not provide backward redirect, you would have to add this binding redirect to your app.config file. We generally do not recommend you redirect to use an older version although I dotn see any real reason why it shudl not work as long as you are not using any 4.112.3.0 specific features. Loading the assembly that the application was compiled with is a security thing and is the way it works.
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Oracle.DataAccess.resources, Version=10.2.0.100, Culture=es, PublicKeyToken=89
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Oracle.DataAccess.resources, Version=10.2.0.100, Culture=fr, PublicKeyToken=89
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Thanks just installed from http://www.oracle.com/technology/software/tech/dotnet/utilsoft.html
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>>Could not load file or assembly 'Oracle.DataAccess, Version=4.112.4.0" error.
Whether all projects have the same issue?
Please make sure that it is not the platform target issue in your project property. Or the setup version issue.
Reference:
https://social.msdn.microsoft.com/Forums/en-US/9827bb73-a58b-415d-ad93-8e08f3a1258b/need-urgent-help-could-not-load-file-or-assembly-39oracledataaccess-version411220?forum=csharpgeneral
http://forums.asp.net/t/1661229.aspx?How+to+change+assembely+reference+to+Oracle+DataAccess+in+prod+
In addition, if still no help, since the oracle is the third party tool, I suggest you post this issue to the Oracle forum:
https://community.oracle.com/community/database
Best Regards,
Jack
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
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Can't add reference to Oracle.DataAccess in VS2008 project on Windows XP

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