Most of the online documentation for the chart is dedicated to databinding scenarios and samples, but in particular, see: http://help.infragistics.com//NetAdvantage/DV/2009.2/CLR3.5/?page=SL_DV_xamWebChart_Accessing_Data.html. In Silverlight, you do not have access to a DataSet/DataTable/DataRow class, so by the time the SQL data reaches the UI you will no doubt have transformed the data into some sort of other representation. The help documentation assists you with how you can bind object representations of the data to the chart.

Does that help with your understanding? Do you have further questions?

-Graham