In WCF Data Services there is a set of not supported LINQ queries and you will get NotSupportedException if you try to group RadGridView for WPF bound directly to such IQueryable or through QueryableCollectionView/VirtualQueryableCollectionView. There is an easy way to enable this and to achieve your goal you will need to inherit from VirtualQueryableCollectionView, override CreateView() method, download all the data from the service if the collection is grouped and group the data on the client.


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