Connection string to SQL by EntityFramework and MVC

Connection string to SQL by EntityFramework and MVC

I write web page in MVC, which use Entity Framework as ORM mapper. I put
my connection string to web.config file. Here is it:
<add name="JP_CMS" connectionString="Data Source=.;Initial Catalog=JP_CMS;
User Id=CmsWebUser;Password=abcd1234abcd1234;"
providerName="System.Data.SqlClient"/>
I try to get data by this C# code
public DataBaseContext()
: base("JP_CMS")
{
Database.SetInitializer(new
DropCreateDatabaseIfModelChanges<DataBaseContext>());
}
//------------------------------
var db = new DataBaseContext();
var result = db.Articles.ToList(); //<- here is thrown exception
//------------------------------
My local SQL server is running, this table is exists, but I get excepion
like in this:

I think it is the most important expection: "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)"
Could you help my by give some idea what I make wrong?