Windows – How to Make ODP.NET 4.0 (64 bit) working on 64 bit machine Windows 7

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I have installed the Oracle Client for the 64 bit machine using the XCopy 11.2 provided by Oracle (Installed everything as per the read me instructions).

I am using Visual Studio 2010 and the project is of type ASP.NET Website.

When I tried to execute my ASP.NET Website using the Oracle Connection installed above..it is giving me the error from the web.config file during compile time.

**

"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"

**

It worked if I changed the value of Enable 32-Bit Applications to True in IIS App pool.

But my requirement is to make it work on 64 bit machine with 64 bit ODP.NET connector, So I do not want to change the value of Enable 32-Bit Applications to True.

So, If you could please help me finding an answer that would be greatly appreciated. Please help me fixing the above error.

Best Answer

The best possibility to handle this is to use the x86 version locally with Visual Studio and x64 version on the server with IIS. To do this you have to download both versions - copy one in folder lib\x86 and the other in lib\x64 After this you have to modify the project file(s) - visual studio supports conditional references. Add following section to your project file:

<PropertyGroup>
     <ReferencesPath Condition=" '$(Platform)' == 'x86' ">..\Lib\x86</ReferencesPath>
     <ReferencesPath Condition=" '$(Platform)' == 'x64' ">..\Lib\x64</ReferencesPath>
</PropertyGroup>

After this reference the odp.net assmebly like this:

<Reference ... processorArchitecture=$(Platform)">
   <SpecificVersion>False</SpecificVersion>
   <HintPath>$(ReferencesPath)\Oracle.DataAccess.dll</HintPath>
   <Private>True</Private>
</Reference>

This way when you can build locally as x86 and on the server x64 and always the correct version of Oracle.DataAccess.dll will be referenced.

Alternatively if you only want to use the x64 version than you have to stick to IIS even you work locally OR you could try to run the open source version of Cassini in x64 mode (http://cassinidev.codeplex.com).

For me the best possibility is to reference both versions as described above - this has been working fine for everyone on my team for a while now.

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