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I am running Visual Studio 2010 and SQL Server Express 2012. When trying to click on an .mdf file I get:

Failed to generate a user instance of SQL Server due to a failure in starting the process for the user instance. The connection will be closed.

My connection string is

Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\Movies.mdf;Integrated Security=True;User Instance=False

Any help would be appreciated!

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  • Is the MDF already in use by another instance? Commented Oct 25, 2016 at 13:37
  • 1
    Possible duplicate and solution, hopefully. stackoverflow.com/questions/281500/… Commented Oct 25, 2016 at 14:46
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