"Cannot obtain Oracle Client information from registry" Error

The error message "Cannot obtain Oracle Client information from registry" when working with Oracle typically indicates that either the Oracle Client is not installed on your system, or there is a mismatch in the bitness between your application and the installed Oracle Client.

To resolve this issue, please follow these steps:

1. Install Oracle Client:

Ensure that the appropriate Oracle Client for your environment is installed on the machine where your application is running. You will need to choose the client version that is compatible with your Oracle database server.

2. Configure Connection in tnsnames.ora:

Verify that your connection details to the Oracle server are correctly configured within the tnsnames.ora file. This file is usually located in the NETWORK\ADMIN subdirectory of your Oracle Client installation directory.

3. Match Platform Target with Oracle Client Bitness:

This is a crucial step. The Platform target setting of your project must align with the bitness of your installed Oracle Client.

The error you are facing says that Oracle Client is not installed or the bitness of the application doesn't match to the bitness of the client.

1. If you have installed a 64-bit Oracle Client (e.g., "Oracle for Windows (x64)"), your project's Platform target should be set to "x64".
2. If you have installed a 32-bit Oracle Client, your project's Platform target should be set to "x86".
   

Important: Setting the Platform target to "Any CPU" can lead to this error if the bitness of your application at runtime doesn't match the installed Oracle Client. As shown in the accompanying screenshot of the Visual Studio Build settings, you can adjust the "Platform target" dropdown to "x86" or "x64" as needed.

By ensuring that the Oracle Client is installed, the connection is configured correctly, and the Platform target of your application matches the bitness of the Oracle Client, you should be able to resolve the "Cannot obtain Oracle Client information from registry" error.

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