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Editorial Team
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Asked: 2026-06-17T21:18:22+00:00

I am getting the following error whenever I am trying to open the db_name.mdf

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I am getting the following error whenever I am trying to open the db_name.mdf file:

The database '{path}\db_name.MDF' cannot be opened because it is version 706. This server supports version 662 and earlier. A downgrade path is not supported. Could not open new database 'db_name.MDF'. CREATE DATABASE is aborted. An attempt to attach an auto-named database for file {$path}\db_name.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.

Connection string as follows:

<add name="PasswordDBContext" connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\db_name.mdf;Integrated Security=True" providerName="System.Data.SqlClient" />

I am working on a asp.net mvc 4 project within visual studio.

Any help to get the issue resolved are very much appreciated. Thanks.

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1 Answer

  1. Editorial Team

    LocalDB is a new feature introduced in SQL 2012 Express – you will need to install SQL 2012 Express LocalDb if you need to use an MDF in this manner.

    Krzysztof Kozielczyk has blogged several entries around on LocalDB here – take note especially of the issues when running under ‘Full IIS’.

    IMO using LocalDb with ASP.NET is for a developer machine config only – i.e. when you are ready to deploy your (code first?) MVC 4 app to a testing or production environment, you should consider attaching ASPNETDB.MDF more permanently to a SQL Instance.

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