Error using msdn sample Walkthrough: Binding WPF Controls to an Entity Data Model

[gerhard-louis]

adventureWorksLTEntities = new AdventureWorksCustomerEditor.AdventureWorksEntities();
customerViewSource = ((System.Windows.Data.CollectionViewSource)(this.FindResource("customerViewSource")));
System.Data.Objects.ObjectQuery<AdventureWorksCustomerEditor.Customer> customerQuery = this.GetCustomerQuery(adventureWorksLTEntities);

this.GetCustomerQuery throws an exception informing me that i am missing a using directive or an assembly reference

Can someone please guide me on this

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