In the Part 1 and Part 2 of this series we discussed how to use LINQ to SQL features to query and manipulate data. We also learnt to call stored procedures via LINQ to SQL. In the previous examples our approach was manual in that we ourselves created the custom data context and entity classes. Visual Studio comes with an inbuilt designer to perform the same task. This article will teach you how to use the designer and consume the created classes in your application.