MS chart control in VS 2010

thanks for reply.. i mean i cant see the properties of the charts in property window..
and <asp:chart runat="server" ID="chart1" DataSourceID="SqlDataSource1" Height="454px"
Width="716px">
<series>
<asp:Series Name="Series1" ChartType="Pie" XValueMember="YardName" IsValueShownAsLabel="True"
YValueMembers="Column1">
</asp:Series>


<chartareas>
<asp:ChartArea Name="ChartArea1">
</asp:ChartArea>


<legends>

<asp:Legend Title="Yard Wise Revenue"/>

</asp:chart>
... and for the above code a green line is underlined for <asp:chart> if we take mnouse over
that it displays "Element 'Chart' is not a known element. This can occur if there is a compilation error in the Web site, or the web.config file is mssing" ... What to do... help me..

i want to add two values in the legend . i legend only one value is displayed i.e name of the
field . and the value is displayed in the graph.. i want to display the value also in
legend ex: in legend
[] SCHOOL STRENGTH - 15000
[] STUDENT STRENGTH - 1600000
.. so i want to display both the name and value in legend..
help me..