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When we defined our data model, the LINQ to SQL designer also created a custom Data Context class that provides the main conduit by which we'll query our database and apply updates/changes.

In the example data model we defined above this class was named "Northwind Data Context".

In Part 2 of this series I walked through how to create a LINQ to SQL class model using the LINQ to SQL designer that is built-into VS 2008.

Below is a class model created for the Northwind sample database and which I'll be using in this blog post: When we designed our data model using the LINQ to SQL data designer above we defined five data model classes: Product, Category, Customer, Order and Order Detail.


I'm not 100% sure about LINQ but i would say that the seperation is based on transaction control.You apply any number of updates, inserts or deletes.


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