I am trying to create an ADO.Net entity Data Model of an existing oracle 11g database, however I cannot even get past the step of Database Connection.

Every time I attempt to test the connection Visual Studio closes without any details as to the error. Just this screen

Error Image

I am using following:

Visual Studio 2010 Ultimate

.NET 4.0.3

Oracle 11g client


Windows 7

Any help is appreciated. Thank you


This what I got from Event viewer of windows:

Faulting application name: devenv.exe, version: 10.0.40219.1, time stamp: 0x4d5f2a73

Faulting module name: oran11.dll, version:, time stamp: 0x4bb34692

Exception code: 0xc0000005

Fault offset: 0x0028deee

Faulting process id: 0x2020

Faulting application start time: 0x01cd5f6aa0a48f4f

Faulting application path: C:\Program Files (x86)\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe

Faulting module path: C:\app\User\product\11.2.0\client_2\bin\oran11.dll

Report Id: c2394ba8-cb5e-11e1-8347-005056c00008

  • This is not the right place for this question. It belongs on either StackOverflow or SuperUser. This site is designed for system admin questions, not development or desktop debugging (unless its for all of your desktops). – Brent Pabst Jul 11 '12 at 14:05
  • @BrentPabst Thank you for notifying me. How could I migrate my question to SuperUser? – AbdulAziz Jul 11 '12 at 14:06
  • If you ever need a Question migrated just Flag it and explain why/where. A mod will take care of it. Thank you! – Chris S Jul 11 '12 at 17:15

This occurs when you install the ODAC into an existing Oracle Home.The OCI.DLL in your Oracle_Home was locked during the installation and was not overwritten.The OCI.DLL is now old and out of synch with the other DLLs, hence the crash.

The easiest solution is to simply reinstall into a new Oracle_Home (directory). If you must use the same Oracle_Home name and directory, you will still need to delete the now corrupted Oracle_home and then reinstall, using the following steps:

  • Use the installer to uninstall the entire oracle home that is crashing.
  • Look at the home in windows explorer. oci.dll should still be there.
  • Rename oci.dll to oci.toanything.
  • Reboot machine.
  • Go back to windows explorer and delete all remaining files in the oracle home, including oci.toanything.
  • Install ODAC.

Hope it helps.

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