I am currently trying to debug an Asp.net 2.0 project with a c# code behind, without receiving errors, in Chrome through Visual Studio 2012. The solution was originally created in VS 2005 and upgraded/imported it into VS 2012. However, I am encountering this error when I attempt to run the solution:

Could not load file or assembly 'System.Data.OracleClient, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

I have added references to System.Data.OracleClient to each of the projects within the solution, but this has not resolved the issue. Additionally, I have checked the GAC (Global Assembly Cache) for a reference to the assembly (System.Data.OracleClient); it is present. I have also added a reference to the assembly (<add assembly="System.Data.OracleClient, Version=, Culture=neutral, PublicKeyToken=b77a5c561934e089" >) to the web.config file for version 2.0 of .Net (C:\WINNT\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config). I noticed that the project seems to look for the dll in the bin folder of the solution, so I have copied the dll from the GAC to the bin. None of the above steps have resolved the issue. I continue to receive the same error message when the solution is debugged. Any answers or suggestions you could provide would be greatly appreciated. Thank you in advance.