You may find our demo
helpful as it demonstarates two types of Charts - Pie and Bar populated from SQL database. The full source code together with the database can be found under your local download path - for example - C:\Program Files\Telerik\RadControls for ASP.NET AJAX Q1 2011
As a side note -- please send the thread according to it's Product and Technology used so that it is easier for us to follow it. In your case the thread should be sent with Product: RadChart for ASP.NET AJAX.
the Telerik team