Hello Vincenzo Casolani,
I've created a sample project for you that demonstrates how to use LinqToSql with our RadGridView control.
I've chosen to create the sample project as a standard WPF application since the limitations of Xbap applications would have made the sample too complicated and cumbersome to understand. The are quite a few comments in the sample that should aid you to quickly understand how to implement CRUD functionality using our grid control.
Hope this helps.
All the best,
the Telerik team
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