The connection string you are using is wrong.
Please try to use the correct one according to your configurations.
For that you have one awesome website - http://www.connectionstrings.com/
Search for the required connection string according to the database and technology.
For Example (SQL Server 2008) - Connection strings for SQL Server 2008
For Local DB, you can just provide a dot "." instead of (localdb)\v11.0
So, you can try with the below one...
Provide necessary UseName and Passwords.