How to use Chart Control in ASP.Net 4.0

hello,

I work with Chart control in my project  but when I tried to change my bar chart with the properties of the control, for example, add a new series nothing changes on the Chart at the same aspx code:

<asp:Chart ID="Chart1" runat="server" DataSourceID="LinqDataSource1">
    <Series>
        <asp:Series Name="Series1">
    </asp:Series>
    </Series>
    <ChartAreas>
        <asp:ChartArea Name="ChartArea1">
        </asp:ChartArea>
    </ChartAreas>
</asp:Chart>

can you help me plz