The C1RatingExtender control allows you to generate customizable star rating widgets automatically.
RatingExtender Markup
The following markup creates a C1RatingExtender control. Set the TargetControlID property to attach the extender to a control.
<cc1:C1RatingExtender ID="DropDownList1_C1RatingExtender" runat="server"
TargetControlID="DropDownList2">
</cc1:C1RatingExtender>