SQL Server 2008 and Visual Studio 2012

I have problem with my VS 2012.

I have installed SQL Server 2008. The next step in what I did was to install SQL2000SampleDb.msi (Northwind). On the command line, I installed everything, by this steps:

cd "C:\SQL Server 2000 Sample Databases"
sqlcmd -S .\sqlexpress -i instnwd.sql

Request:

• Change database content to 'master'.
• Change database content to 'Northwind'.

3 step: sqlcmd -S .\sqlexpress, and:

use northwind
select LastName from employees
go

and all was ok... but if I want to connect with VS I have problem. I'm creating a Windows Forms Application

-> menu: Project -> Add New Data Source -> select Database -> Dataset.

And now I can't see any connection to select, I have only the view:

http://pl.tinypic.com/r/1433rt3/8

and the second way which I did was such:

View -> server explorer -> PPM on Data connection -> "Add Connection"
     -> Microsoft SQL Server (SqlClient)

and server name W-Komputer, when I wanted to select a database this error appears:

http://i60.tinypic.com/2exvuir.png

I tried this way, but not any effects: (please search in google: How to: Install Sample Databases - I haven't 10 reputation :( and I can't add more that 2 links)

You need to use W-Komputer\sqlexpress as this is the name of the instance if Sql on your computer.

The . when you are using sqlcmd is referring to your computer/localhost.