AJAX :: Verify If Points Exists On Line Chart Control

This is my aspx code :

<asp:Chart ID="ChartAlertes" runat="server" Width="500px">
<Titles>
<asp:Title Text="Nombre d'alertes et leurs status en fonction des filtres renseignés"
BorderColor="Black" Alignment="TopCenter">
</asp:Title>
</Titles>

[code]...

I display 2 Points (2 columns) in the Chart Control and I change the color of the each Points with :

ChartAlertes.Series[0].Points[0].Color = System. Drawing. Color.Red;ChartAlertes.Series[0].Points[1].Color = System.Drawing.Color.DarkOrange;

But sometimes, I have only 1 Point to display or nothing at all on the Chart. So I'd like to check If there are some Points before to put the color of each Point.

For example :

if (ChartAlertes.Series[0].Empty == false)
{
//...
}