Is there a easy way to handle it? Or must i select each item from database to check if it is in the GridViewB?
This depends on the approach you are using to get the data. For instance, if you are using EntityFramework, you could load the second items source like:
var itemsSource = DBEntities.Foos.Where(x => !GridViewB.ItemsSource.Contains(x))
Other than that you will have to loop through the items and take out the ones that you don't need.
Hope this helps!
All the best,
the Telerik team
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