I have installed sq lserver 2014 and sql server 12 express edition in my PC. When I coonect the visual studio connectionString using 2014 it works well. But when I try to connect with 2012 it gives 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. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
How to find out if my PC is registered under sql server 2014 windows authentication. And how do I change it to use sql server 2012 windows authentication.
So my visual studio connectionString will be able to use sql server 2018 server and instance. Please help me.