using sql server with vs 2012 - sql-server

Am facing a problem with using SQL server 2012 along with VS 2012 ,, when I try to make new database it gives me this 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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)”
I've tried to install the SQL Server Express 2012 again but still the same problem.
any suggestions ?
thanks in advance .

Most Probably you are something missing in ConnectionString, might be server name
open sql server and check server name.
working connectionString:

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If you need additional resources check out this answer:
https://dba.stackexchange.com/questions/44171/find-all-version-of-sql-server-on-a-network
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refer following link
https://social.technet.microsoft.com/wiki/contents/articles/2102.how-to-troubleshoot-connecting-to-the-sql-server-database-engine.aspx

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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.
I checked Services.msc ---> Here server is running (MSSQL Server)
I started manually so,still it is showing cannot connect to server.
What's the issue? Can anyone help to solve this isssue?
Thanks.

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