public event CustomDrawSeriesEventHandler CustomDrawSeries

Public Event CustomDrawSeries As CustomDrawSeriesEventHandler

using DevExpress.XtraCharts;
//...
chartControl.CustomDrawSeries += OnCustomDrawSeries;
//...
private void OnCustomDrawSeries(object sender, CustomDrawSeriesEventArgs e) {
    // Find all Bar Series by their view type,
    // and fill them with a given color.
    if (e.Series.View is BarSeriesView)
        e.SeriesDrawOptions.Color = Color.SkyBlue;

    // Find the series by its name, 
    // and change its line style to dash-dot-dot.
    // (Here it's assumed that the series view type is LineSeriesView).
    if (e.Series.Name == "Line Series")
        ((LineDrawOptions)e.SeriesDrawOptions).LineStyle.DashStyle =
        DashStyle.DashDotDot;

    // Find all Point Series by the type of its DrawOptions, 
    // and change their marker kind to diamond.
    if (e.SeriesDrawOptions.GetType() == typeof(PointDrawOptions))
        ((PointDrawOptions)e.SeriesDrawOptions).Marker.Kind =
        MarkerKind.Diamond;
}

Imports DevExpress.XtraCharts
'...
chartControl.CustomDrawSeries += OnCustomDrawSeries
'...
Private Sub OnCustomDrawSeries(ByVal sender As Object, ByVal e As CustomDrawSeriesEventArgs)
    ' Find all Bar Series by their view type,
    ' and fill them with a given color.
    If TypeOf e.Series.View Is BarSeriesView Then e.SeriesDrawOptions.Color = Color.SkyBlue
    ' Find the series by its name, 
    ' and change its line style to dash-dot-dot.
    ' (Here it's assumed that the series view type is LineSeriesView).
    If e.Series.Name Is "Line Series" Then CType(e.SeriesDrawOptions, LineDrawOptions).LineStyle.DashStyle = DashStyle.DashDotDot
    ' Find all Point Series by the type of its DrawOptions, 
    ' and change their marker kind to diamond.
    If e.SeriesDrawOptions.[GetType] Is GetType(PointDrawOptions) Then CType(e.SeriesDrawOptions, PointDrawOptions).Marker.Kind = MarkerKind.Diamond
End Sub