Could not load file or assembly 'Oracle.DataAccess,
Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342' or one of
its dependencies. The system cannot find the file specified.
It is problem due to application is not pointing to proper DDL
of oracle access and your GAC is having different version of Oracle.DataAccess.
To correct this you just need to put the below code into
web.config file.
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Oracle.DataAccess" publicKeyToken="89B483F429C47342"/>
<bindingRedirect oldVersion="4.121.1.0" newVersion="4.112.1.2"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
By doing this when application is looking to the version which
is not exist then it will redirect to the exist DLL version.
Generally by doing this you can work with the two same DDL with
dirffrent version and based on the requirement you can call the version of DLL
