You can find getting started information about the RadDomainDataSource here in our online help. Following this tutorial will help you create your own RIA service and a RadDomainDataSource client that is consuming it. You can use a RadGridView to visualize your data returned by the service.
In order for the RadSparkline to work correctly it needs a collection of data (IEnumerable). This can be a simple list of integers or doubles, or a list of business objects that the sparklines extract data from. It is up to you to prepare your data for your sparkline. More information on sparkline data binding can be found here. We have an online demo that demonstrates how you can visualize a sparkline into a RadGridView cell here.
Hope this helps!
the Telerik team
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