Unable to connect to localDB in VS2012 – “A network-related or instance-specific error occurred while establishing a connection to SQL Server…”

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Any chance it is because you forgot to double-escape the backslash? Did you try this:

"Data Source=(LocalDB)\\v11.0;Integrated Security=true"

Or even better, you could just use the @ mark to disable character escaping for the entire connection string:

@"Data Source=(LocalDB)\v11.0;Integrated Security=true"

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