GridView & LinqDataSource

LINQ to SQL (Part 9 - Using a Custom LINQ Expression with the control) - ScottGu's Blog
I'm playing with finding the easiest way to display and manipulate the content of a data table at an ASP.Net page.
The UI control is Grid View. The data is in SQL Server. I'm using Linq for SQL to generate the entities/tables. Entity Framework can only generate entities from tables which contain the primary key.
LinqDataSource is used to provide data and insert/update/delete features to the GridView.