SQL Server LocalDB Error 50: How to Fix 'Cannot create an automatic instance'?

SQL Server LocalDB Error 50: Resolving local database runtime error

It is common to encounter the error message "A network-related or instance-specific error occurred while establishing a connection to SQL Server" when connecting to SQL Server, especially when using a local database. This error can occur when trying to access the database from an ASP.NET MVC 5 application.

Error reason:

The error "SQL Network Interface, Error: 50 - A local database runtime error occurred. Unable to create automatic instance" occurs when the application cannot establish a connection to the LocalDB instance. LocalDB is a lightweight database server that runs on your local computer.

Solution:

The recommended way to resolve this issue is to modify the connection string in the web.config file to use the correct server name for the LocalDB instance:

<code><connectionstrings><add connectionstring="Data Source=(localdb)\mssqllocaldb; ..." name="DefaultConnection"></add></connectionstrings></code>

Other notes:

• Make sure that SQL Server 2014 Express and LocalDB instances are installed.
• Verify that SQL Server is configured to allow remote connections.
• Make sure the MyDatabase instance is not disconnected after the application starts. Refreshing the database in Server Explorer may allow you to view the tables.
• Consider using 2012 SSMS to connect to 2014 LocalDB.
• If necessary, uninstall and reinstall SQL Server to create a new LocalDB instance.

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