How to check if databound chart is empty on server side?

Hello,

I have a databound chart to sqldatasource. In DataBound event on server-side I want to check if the chart has data and if it does not I want to hide it. I've tried this but without any luck (VB.NET):

 Protected Sub RadHtmlChart1_DataBound(sender As Object, e As EventArgs) Handles RadHtmlChart1.DataBound
        If RadHtmlChart1.PlotArea.Series(0).Items.Count = 0 Then
            RadHtmlChart1.Visible = False
        Else
            RadHtmlChart1.Visible = True
        End If
End Sub