You can wire RadDataFilter, RadDataPager and RadGridView directly to our new control RadDataServiceDataSource as shown in this online sample. To learn more about the RadDataServiceDataSource control, please take a look at my blog post.
As for saving and loading the filter criteria, you will have to manually traverse over RadDataFilter.FilterDescriptors collection and save the object graph into some kind of XML format. Then you can parse this saved XML and restore the FilterDescriptors back. Since this is a general .NET topic, i.e. traversing a tree and writing/reading XML, we don't have a specialized example for this.
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