You use the Entity Data Model Wizard to generate an Entity Data Model from an application database. A Customer entity includes an Orders property that gives related Order instances. You need to ensure that orders given by the Orders property are retrieved when the Customer entity is retrieved.

What should you do?

When you know the exact shape of the graph of related entities that your application requires, you can use the Include method on the ObjectQuery to define a query path that controls which related entities to return as part of the initial query. When you define a query path, only a single request against the database is required to return all entities defined by the path in a single result set and all related entities of the type specified in the path are loaded with each object that the query returns.