How to connect to DB(LocalDB) in C# using LINQ to SQL?

Question

SQL

Looked msdn there it is written
// Northwnd inherits from System.Data.Linq.DataContext.
Northwind nw = new Northwind(@"northwind.mdf");
But VS says there is no such namespace, what to do?

Answer 1

apparently the reference to System.Data.Linq.dll is not specified