Unable to connect to localdb when using sql server 2014 ,name changed to MSSQLLocalDB

While running mvc 5 application i tried using sql server 2014 Localdb but when i click the registration link i faced an error.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.
After searching on google i found from microsoft website that from sql server 2014 localdb versions will not be like v11.0 ,Now they have changed the localdb instance as MSSQLLocalDB .So i was unable to connect to (LocalDB)\v11.0.
Below are the 2 connection string versions that are to be used for connecting to sql server localdb.
For Sql Server 2012 

<connectionstrings>
<add connectionstring="Data Source=(LocalDB)\v11.0;

AttachDbFilename=|DataDirectory|\aspnet-AspnetIdentitySample-20130627083537_2;

Integrated Security=True;Integrated Security=True" 

name="DefaultConnection" providername="System.Data.SqlClient">
  </add>
</connectionstrings>


For Sql Server 2014

<connectionstrings>
<add connectionstring="Data Source=(LocalDB)\MSSQLLocalDB;

AttachDbFilename=|DataDirectory|\aspnet-AspnetIdentitySample-20130627083537_2;

Integrated Security=True;Integrated Security=True"

 name="DefaultConnection" providername="System.Data.SqlClient">
  </add>
</connectionstrings>