Excel VBA - How do you set line style for chart series?

Question

I would like the plot lines in a chart to be either solid, circle dot, or square dot based upon a certain criteria specified by the user. I can successfully set the line color

Answer 1

YourChartSeries.Border.LineStyle = [some value from the XlLineStyle enumeration]

UPDATE: recording in XL 2010 I get this -

ActiveChart.SeriesCollection(1).Select
With Selection.Format.Line
    .Visible = msoTrue
    .DashStyle = msoLineSysDot
End With
ActiveChart.SeriesCollection(2).Select
With Selection.Format.Line
    .Visible = msoTrue
    .DashStyle = msoLineSysDash
End With

Which might be what you're looking for.