The provider is not compatible with the version of Oracle client

Question

I m trying to use the Oracle ODP NET 11g  11 1 0 6 20  Instant Client on my ASP net project as a Data Provider but when I run the aspx page I get a  The provider is not compatible with the version of Oracle client  error message   Any help would be appreciated   I ve referenced the Data Provider in Visual Studio 2005 and the code behind looks like this   using Oracle DataAccess Client      OracleConnection oOracleConn   new OracleConnection    oOracleConn ConnectionString        Data Source MyOracleServerName          Integrated Security SSPI   oOracleConn Open       Do Something  oOracleConn Close      The error for the page looks like this   Exception Details  Oracle DataAccess Client OracleException  The provider is not compatible with the version of Oracle client  Source Error   Line 21   Line 22   Line 23              OracleConnection oOracleConn   new OracleConnection    Line 24              oOracleConn ConnectionString   Line 25                   Data Source MyOracleServerName       OracleException  0x80004005   The provider is not compatible with the version of Oracle client     Oracle DataAccess Client OracleInit Initialize    494    Oracle DataAccess Client OracleConnection  cctor    483  Stack Trace    TypeInitializationException  The type initializer for  Oracle DataAccess Client OracleConnection  threw an exception      Oracle DataAccess Client OracleConnection  ctor    0    Boeing IVX Web RoyTesting Page Load Object sender  EventArgs e  in C  Documents and Settings CE218C Desktop IVX Net Web IVX RoyTesting aspx cs 23    System Web Util CalliHelper EventArgFunctionCaller IntPtr fp  Object o  Object t  EventArgs e   15    System Web Util CalliEventHandlerDelegateProxy Callback Object sender  EventArgs e   33    System Web UI Control OnLoad EventArgs e   99    System Web UI Control LoadRecursive    47    System Web UI Page ProcessRequestMain Boolean includeStagesBeforeAsyncPoint  Boolean includeStagesAfterAsyncPoint   1436

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After several hours of troubleshooting  I found this issue to be caused by having Oracle DataAccess dll  v4 0  in my projects bin directory  but the runtime also loading Oracle DataAccess dll  v2 x  from the GAC  Removing and readding the Oracle DataAccess entry in the project references solved the problem for me   The other files mentioned here did not appear to be necessary in my situation   UPDATE  The root cause of the  The provider is not compatible with the version of Oracle client  error is  generally  that the managed assembly is attempting to load unmanaged libraries which do not match versions  It appears you can force the Oracle driver to use the correct libraries by specifying the library path in the web config1   lt configuration gt     lt oracle dataaccess client gt       lt settings gt         lt add name  DllPath  value  C  oracle bin   gt         lt  --     -- gt       lt  settings gt     lt  oracle dataaccess client gt   lt  configuration gt

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For anyone still having this problem  based on this article  http   oradim blogspot com 2009 09 odpnet-provider-is-not-compatible-with html  I found out that my server was missing the Microsoft C   Visual Runtime Library - I had it on my dev machine because of the Visual Studio installed  I downloaded and installed the  currently  most recent version of the library from here   http   www microsoft com en-us download details aspx id 13523  Ran the setup and the oracle call from C  made it

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We had the same problem  because the Oracle Data dll assembly on a network share was updated by our DBA s  Removing the reference from the project  and adding it again solved the problem

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It would seem to me that though you have ODP with the Oracle Istant Client  the ODP may be trying to use the actual Oracle Client instead   Do you have a standard Oracle client installed on the machine as well   I recall Oracle being quite picky about when it came to multiple clients on the same machine

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Let s make some kind of summary    Error message  The provider is not compatible with the version of Oracle client  can be caused by several reasons    You have no Oracle Client installed  In this case the error message is indeed misleading    Oracle Data Provider for  NET  ODP NET  i e  file Oracle DataAccess dll  is not included in Oracle Instant Client  it has to be installed separately  download from 32-bit Oracle Data Access Components  ODAC   or 64-bit Oracle Data Access Components  ODAC  Downloads  or you have to select according option in Oracle Universal Installer  OUI     Note  when installing the Oracle Data Provider    12 1  then the provider is not automatically registered into GAC  You have to register it manually if needed  see Oracle Doc 2272241 1  The version of ODP NET does not match installed version of Oracle Client  You have to check even the minor version number  For example  Oracle DataAccess dll Version 4 112 3 0 is not compatible with Oracle Client 11 2 0 4  Check versions of ODP NET and Oracle Client carefully  You can use sigcheck on oraociei  dll and or OraOps w dll to get version of Oracle Client   Be aware of different numbering scheme  File version 4 112 3 0 means   NET Framework Version 4  Oracle Release 11 2 0 3 x   There are ODP NET version  1 x    2 x  and  4 x   These numbers are related to Microsoft  NET Framework versions 1 0 3705 1 1 4322  2 0 50727 and 4 0 30319  Version  1 x  was available until Oracle Client 11 1  Version  4 x  was introduced with Oracle Client 11 2 The architecture  32bit or 64bit  of ODP NET does not match your application architecture  A 32bit application works only with 32bit Oracle Client ODP NET respectively a 64bit application requires 64bit Oracle Client ODP NET   Unless you use ODP NET Managed Driver  The  NET Framework version do not match  For example  if you compile your application with Target  NET Framework 2 0 then you cannot use ODP NET version 4 x  The  NET Framework target version must be equal or higher than version of ODP NET  The version of Oracle DataAccess dll on your development machine  i e  the version which is loaded while compiling  is higher than the version on the target machine   Be aware that Oracle DataAccess dll might be loaded from GAC which by default takes precedence over any locally provided file    Solutions   Consider to use the ODP NET Managed Driver  it can be downloaded from Oracle page  64-bit Oracle Data Access Components  ODAC  Downloads  There you only have to copy Oracle ManagedDataAccess dll file to your application directory  nothing else is required  It works for both 32bit and 64bit  In your   csproj  resp    vbproj edit your reference to ODP NET like this    lt Reference Include  Oracle DataAccess  gt     lt SpecificVersion gt False lt  SpecificVersion gt     lt Private gt False lt  Private gt   lt  Reference gt    Attributes like Version     or processorArchitecture     are not required  Your application will load the correct Oracle DataAccess dll depending on selected architecture and target  NET framework  provided that it is installed properly   -  not 100  verified In case you do not know the version of Oracle Client on target machine  e g  it might be the machine of your customer   Go to the download page mentioned above and download the least XCopy version of Oracle Data Access Components  Extract the zip and copy just the Oracle DataAccess dll file to your local machine  In your VS project make a reference to this  most likely outdated  DLL  The version of this DLL is the least version of ODP NET your application will work with  When you run your application then the Publisher Policy in GAC will redirect to actually installed version  I don t think it is a smart approach to take single DLL s and copy them to certain folders  It may work on a  naked  machine but if your target machine has installed any Oracle products there is a high risk for version mismatch  Uninstall any Oracle products from your machine and make a fresh installation  Have a look at How to uninstall   completely remove Oracle 11g  client   it order to get a really clean machine  In case you have to work with 32bit and 64bit applications at the same time  follow this instruction to install both versions on one machine    Assumptions  Oracle Home is called OraClient11g home1  Client Version is 11gR2    Optionally remove any installed Oracle client  Download and install Oracle x86 Client  for example into C  Oracle 11 2 Client x86 Download and install Oracle x64 Client into different folder  for example to C  Oracle 11 2 Client x64 Open command line tool  go to folder  WINDIR  System32  typically C  Windows System32 and create a symbolic link ora112 to folder C  Oracle 11 2 Client x64  see below  Change to folder  WINDIR  SysWOW64  typically C  Windows SysWOW64 and create a symbolic link ora112 to folder C  Oracle 11 2 Client x86   see below  Modify the PATH environment variable  replace all entries like C  Oracle 11 2 Client x86 and C  Oracle 11 2 Client x64 by C  Windows System32 ora112  respective their  bin subfolder  Note  C  Windows SysWOW64 ora112 must not be in PATH environment  If needed set yor ORACLE HOME environment variable to C  Windows System32 ora112 Open your Registry Editor  Set Registry value HKLM Software ORACLE KEY OraClient11g home1 ORACLE HOME to C  Windows System32 ora112 Set Registry value HKLM Software Wow6432Node ORACLE KEY OraClient11g home1 ORACLE HOME to C  Windows System32 ora112  not C  Windows SysWOW64 ora112  You are done  Now you can use x86 and x64 Oracle client seamless together  i e  an x86 application will load the x86 libraries  an x64 application loads the x64 libraries without any further modification on your system    Commands to create symbolic links   cd C  Windows System32 mklink  d ora112 C  Oracle 11 2 Client x64 cd C  Windows SysWOW64 mklink  d ora112 C  Oracle 11 2 Client x86   Some notes     Both symbolic links must have the same name  e g  ora112   In case you want to install ODP NET manually afterwards  take care to select appropriate folders for installation  Despite of their names folder C  Windows System32 contains the x64 libraries  whereas C  Windows SysWOW64 contains the x86  32-bit  libraries  Don t be confused  Maybe it is a wise option to set your TNS ADMIN environment variable  resp  TNS ADMIN entries in Registry  to a common location  for example TNS ADMIN C  Oracle Common network

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I only installed the Oracle Data Provider for  NET 2 0  11 1 0 6 20  and I did not install the Oracle Instant Client  11 1 0 6 0      I just installed it and the error disappeared

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Here s what I did to solve this problem that persisted for 3 long hours    Under Oracle home located at C  oracle product 11 2 0 I had a folder called client 1 where I had previously installed ODP NET bits for Windows 64 bits  Later while trying to debug my ASP NET Web API app with Visual Studio 2012  I kept getting this error message  The provider is not compatible with the version of Oracle client  Searching Google I found that this was happening because I was using ODP NET 64 bits  Then I grabbed ODP NET for Windows 32 bits and installed it but I kept getting the same error message  SOLUTION  deleted the folder client 1 and resinstalled ODP NET 32 bits  Somewhat the installer was mixing bits from the 64 bit version with the 32 bit version  Go figure    Now I m happy again and I can open a new OracleConnection  FINALLY

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I had the exact same problem  I deleted  and forgot that I had deleted  oraociei11 dll after compiling the application  And it was giving this error while trying to execute  So when it cant find the dll that oraociei11 dll  it shows this error  There may be other cases when it gives this error  but this seems to be one of them

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I had the same issue with Oracle DataAccess dll  v4 121 2 0  with 2- homes installation  32 and 64 bit versions   32-bit version workerd  64-bit version didn t   In my case  after 2 days of trying  I found that the problem was permissions on the 64-bit-home version  Many Directories in that version had exclusively overridden permissions where  Authenticated Users  role did not have  Read  access  which is set by default on the parent directory  Those sub-directories included  bin    network admin     nls    oracore    RDBMS  and possibly others  I found them by filtering out  ACCESS DENIED  result in  Process Monitor   Procmon exe  utility from sysinternals  Once the permissions were inherited from the parent directory to those child subdirectories everything started to work    I didn t what to override the permissions on the whole oracle home so I did them one directory at a time  but I guess if you don t worry about security so much you can reset it on the whole corresponding oracle home directory

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I ve been looking into this problem further  and you simply need to grab all the appropriate DLL s from the same downloaded version of ODP Net and put them in the same folder as your Exe file  because ODP Net is fussy about not mixing version numbers   I ve explained how to do this here  http   splinter com au using-the-new-odpnet-to-access-oracle-from-c Here s the gist of it though    Download ODP Net Unzip the file Unzip all the JAR s in it Grab these dll s that were just unzipped    oci dll  renamed from  oci dll dbl   Oracle DataAccess dll oraociicus11 dll OraOps11w dll orannzsbb11 dll oraocci11 dll ociw32 dll  renamed from  ociw32 dll dbl    Put all the DLLs in the same folder as your C  Executable

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Chris  solution worked for me as well   I did however get a follow error message that states    Could not load file or assembly  Oracle DataAccess  or one of its dependencies  An attempt was made to load a program with an incorrect format    Apparently  in the foreign language of Oraclish  that means that your program are either targeting all platforms  or 32-bit machines  Simply change your target platform in Project Properties to 64-bit and hope for the best

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Also look for IIS Application pool Enable 32-bit true or false flag  when you see this message  some oracle forum directed me for this

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I encountered this problem after I installed Oracle Data Tools for Visual Studio 2015  and then fighting with Oracle for a good hour   I decided to try reinstalling Oracle client again instead of this mess with file copying  config changes  etc   and that worked for me

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On a 64-bit machine  copy  msvcr71 dll  from C  Windows SysWOW64 to the bin directory for your application  On a 32-bit machine  copy  msvcr71 dll  from C  Windows System32 to the bin directory for your application    http   randomdevtips blogspot com 2012 06 provider-is-not-compatible-with-version html

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i have the same problem but in my case i can t just copy the dlls into the bin folder  then i only  rebind  the assembly version    lt  xml version  1 0  encoding  utf-8    gt   lt configuration gt     lt runtime gt           lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt         lt dependentAssembly gt           lt assemblyIdentity name  Oracle DataAccess  publicKeyToken  89B483F429C47342  culture  neutral   gt           lt bindingRedirect oldVersion  2 112 2 0  newVersion  2 112 1 0   gt         lt  dependentAssembly gt       lt  assemblyBinding gt     lt  runtime gt   lt  configuration gt

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Lots of theoretical answers here  but here comes a working example with code that you can copy and paste and test immediately    I installed the Oracle Express database OracleXE112 which already comes with some preinstalled demo tables   When you start the installer you are asked for a password  I entered  xxx  as password   not used in production  My server runs on the machine 192 168 1 158 On the server you must explicitely allow access for the process TNSLSNR exe in the Windows Firewall  This process listens on port 1521  If you get a timeout error from the below code check your firewall  OPTION A  For C    NET2 or  NET4  you can download ODAC11  from which you have to add Oracle DataAccess dll to your project  Additionally this DLL depends on  OraOps11w dll  oci dll  oraociei11 dll  130MB    msvcr80 dll   These DLLs must be in the same directory as the EXE or you must specify the DLL path in  HKEY LOCAL MACHINE SOFTWARE Oracle ODP NET 4 112 4 0 DllPath  On 64 bit machines write additionally to HKLM SOFTWARE Wow6432Node Oracle     OPTION B  If you have downloaded ODAC12 you need Oracle DataAccess dll  OraOps12w dll  oci dll  oraociei12 dll  160MB    oraons dll  msvcr100 dll  The Registry path is HKEY LOCAL MACHINE SOFTWARE Oracle ODP NET 4 121 2 0 DllPath OPTION C  If you don t want huge DLL s of more than 100 MB you should download ODP NET Managed12 x x x xxxxx zip in which you find Oracle ManagedDataAccess dll which is only 4 MB and is a pure managed DLL which works in 32 bit and 64 bit processes as well and depends on no other DLL and does not require any registry entries  The following C  code works for me without any configuration on the server side  just the default installation      using Oracle DataAccess Client  or using Oracle ManagedDataAccess Client         string oradb    Data Source  DESCRIPTION           ADDRESS LIST  ADDRESS  PROTOCOL TCP  HOST 192 168 1 158  PORT 1521             CONNECT DATA  SERVER DEDICATED             User Id SYSTEM Password xxx     using  OracleConnection conn   new OracleConnection oradb          conn Open        using  OracleCommand cmd   new OracleCommand                  cmd Connection    conn          cmd CommandText    select TABLESPACE NAME from DBA DATA FILES            using  OracleDataReader dr   cmd ExecuteReader                          while  dr Read                                  listBox Items Add dr  TABLESPACE NAME

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Just two steps to solve this issue    go to advance setting of application pool and set  Enable 32 bit Application  flag to True  Make sure all Dlls in your Bin is 32 bit version now      best of luck

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Does the IIS IWAM user have permissions on the Oracle directory  Can you connect to this data source using another app  such as Excel or Access

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You should  ignore  all the x86 x64 talk here for starters and instead try the ODP NET Managed Driver  if you are using  Net v4     https   www nuget org packages Oracle ManagedDataAccess   https   www nuget org packages Oracle ManagedDataAccess EntityFramework   Oracle ODP net Managed vs Unmanaged Driver  Avoid all the  unmanaged  what DLL what architecture issues   D  about time Oracle    The NuGet package  also works for 11g      The old   manual method   For info on how to convert to using the managed libraries    First  here is a great code comparison of managed vs unmanaged  http   docs oracle com cd E51173 01 win 122 e17732 intro005 htm ODPNT148 Ensure you have downloaded the ODP NET  Managed Driver Xcopy version only From the downloaded zip file  copy and paste into your project directory    Oracle ManagedDataAccessDTC dll Oracle ManagedDataAccess dll  Add a reference to Oracle ManagedDataAccess dll Ensure your exe is released  added to Application Folder in VS2010  with both dlls

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This issue could by happen while using unmanaged oracle reference if you have more than one oracle client   or sometimes if you reference different version There is two way to solve it     First and fast solution is to remove unmanaged reference and use the managed one from NuGet see this before to go with this option Differences between the ODP NET Managed Driver and Unmanaged Driver  Second solution is to fix project unmanaged target version like the below      First Check oracle project reference version  from project references  dependencies  gt  assemblies    gt  Oracle DataAccess right click  gt  properties         Then check oracle GAC version  got to gac from run  Win R   quot  windir  Microsoft NET assembly quot    Check the platform that matches with you project platform      to check you target platform  right click on your project  gt  properties      From gac folder search to Oracle DataAccess     Right Click on Oracle DataAccess  gt  properties  gt  details and check version      if you notice the versions are different this is an the issue and to fix it we need to redirect assembly version  in startup project go to config file and add the below section      lt assemblyBinding xmlns  quot urn schemas-microsoft-com asm v1 quot  gt         lt dependentAssembly gt           lt assemblyIdentity name  quot Oracle DataAccess quot  publicKeyToken  quot 89b483f429c47342 quot  culture  quot neutral quot    gt           lt bindingRedirect oldVersion  quot 0 0 0 0-5 0 0 0 quot  newVersion  quot 4 121 2 0 quot    gt         lt  dependentAssembly gt   lt  assemblyBinding gt    like this  oldVersion   should be cover your project version newVersion   GAC version publicKeyToken   From GAC

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This can be caused by running a 64bit  NET runtime against a 32bit Oracle client  This can happen if your server you are running the app on it 64 bit  It will run the  NET app with the 64bit runtime  You can set the CPU flag on your project in VS to run in the 32bit runtime

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install ODP Net on the target machine and it should solve the issue    copying the dll s does not look a good idea

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TLDR Version    Use the 12c 100  managed provider instead  If you must use the old provider  you need to point Oracle DataAccess dll to the unmanaged Oracle Client Dlls that are of the correct version   If you have multiple Oracle Clients installed on your machine that maybe a simple as including the  DllPath  configuration variable  see below  in you app config  but you may also need to install a new oracle client to point to    Full version   First  lets make sure we understand the components of the old unmnaged provider  not the new 12c 100  managed provider    It s made up of two pieces    the managed  net component - Oracle DataAccess dll the unmanaged  non- net  client   Simply speaking  Oracle DataAccess dll is nearly just a wrapper  translating  net instructions into ORACLE-NET instructions for the unmanaged client   That said  when you load Oracle DataAccess there is a order in which it tries to locate the unmanaged client dlls that it needs   From the Oracle Documentation      The Oracle DataAccess dll searches for dependent unmanaged DLLs  such   as Oracle Client  based on the following order       1 Directory of the application or executable       2 DllPath setting specified by application config or web config       3 DllPath setting specified by machine config       4 DllPath setting specified by the Windows Registry       HKEY LOCAL MACHINE Software Oracle ODP NET version DllPath      5 Directories specified by the Windows PATH environment variable    So in your case  your app followed this process above and found a path that has unmananged dlls that are too old relative to the Oracle DataAccess dll assembly that you are using   It could just be that the only Oracle Client install on that machine is too old   But this comes into play if you have more than one client installed on the machine and the unmananaged files were found first in a different but older installation   If the later  the simple thing to do is use the dllPath configuration variable in your config and point it at the correct Oracle Home Bin folder    lt configuration gt     lt oracle dataaccess client gt        lt add key  DllPath  value  c  oracle product 1 1 0-xcopy-dep BIN   gt     lt  oracle dataaccess client gt   lt  configuration gt    If you want to install a fresh copy of the client  the xcopy version is the smallest and contains the  instant client  and point the DllPath above to this new location   But any oracle client install will work   But if you want to avoid all this unmanaged client resolution stuff  see if you can update your app to use the 100  managed provider instead - it truely is just one or two managed assemblies without any dependency on unmananged files   Its also possible that you aren t loading the Oracle DataAccess dll that you think you are if it is installed in both your bin directory and your GAC  but I think that is the less likely senario   See the assembly resolution process for more information

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I didn t go down the road of getting new DLL s  We had a bunch of existing projects that work perfectly fine and it was only my new project that was giving me headache so I decided to try something else    My project was using an internally developed Internal dll that depended on Oracle DataAccess dll v4 112 3 0  For some reason  when publishing  Visual Studio always uploaded v4 121 0 0  even though it wasn t explicitly specified in any of the config files  That s why I was getting an error   So what I did was    Copied Internal dll from one of the successfully running projects to my web site s  bin  just to be on the safe side   Copied Oracle DataAccess dll from one of the successfully running projects to my web site s  bin  Add Reference to both of them from my web site  Finally Oracle DataAccess reference showed up in myWebSite csproj  but it showed the wrong version  v4 121 0 0 instead of v4 112 3 0  I manually changed the reference in myWebSite csproj  so it now read    lt Reference Include  Oracle DataAccess  Version 4 112 3 0  Culture neutral  PublicKeyToken 89b483f429c47342  processorArchitecture x86  gt     lt SpecificVersion gt False lt  SpecificVersion gt     lt HintPath gt bin Oracle DataAccess dll lt  HintPath gt   lt  Reference gt

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For Oracle 11g  11 1 0 7 20  I had to add the following dlls along with my Exe to work    oci dll OraOps11w dll oraociicus11 dll  pretty huge close to 30mb  Oracle DataAccess dll

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I faced a similar issue and the root cause was that GAC had 2 oracle dataaccess versions i e  v4 0 4 112 2 0 and v4 0 4 112 4 0   My application was referring to v4 0 4 112 2 0   so when I removed v4 0 4 112 4 0 from GAC  it worked fine   GAC path   C  Windows Microsoft NET assembly GAC 64 Oracle DataAccess  Before      After     To remove a version  one can simply delete the corresponding folder from GAC

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Recently I had to work on an older project where the solution and all contained projects were targeted to x32 platform  I kept on trying to copy Oracle DataAccess dll and all other suggested Oracle files on all the places  but hit the wall every time  Finally the bulb in the head lit up  after 8 hours      and asked to check for the installed ODAC assemblies and their platform  I had all the 64-bit  x64  ODAC clients installed already but not the 32 bit ones  x32   Installed the 32-bit ODAC and the problem disappeared   How to check the version of installed ODAC  Look in folder C  Windows assembly  The  Processor Architecture  property will inform the platform of installed ODAC   Eight hours is a long time for the bulb to light up  No wonder I always have to slog at work

[c#] The provider is not compatible with the version of Oracle client

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