Hi Swetaketu,
Thanks for using Syncfusion support.
We have analyzed your query. Your requirement can be achieved by specifying value to the dashStyle in border property of series. Find the code snippet below.
Windows Forms [C#]
ChartSeries series = new ChartSeries();
series.Style.Border.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;
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In the above code we have specified DashDot style, you can change with respect to your scenario.
Screenshot:
Sample for reference can be find from below link.
Thanks,
Dharani.