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How to set trendlines for Excel chart series in C#, VB.NET?

Platform: WinForms |
Control: XlsIO |
Published Date: March 15, 2018 |
Last Revised Date: March 15, 2018

This article explains how to set trendlines for chart series using XlsIO.

How to set trendlines for chart series?

A trendline is always associated with a data series, but a trendline does not represent the data of that data series. Instead, a trendline is used to depict trends in your existing data or forecasts of future data.

Methods to add trendline for the chart series

Overloaded Method 1: Adding the trendline with no parameters. Default, trendline type is linear.


Overloaded Method 2: Adding the trendline with passing ExcelTrendlineType parameter.


To format the trendlines please refer the IChartTrendline trendline properties link.

Download Complete Sample


Download input file with data


To know more about creating charts with various settings using XlsIO, please refer the documentation.


The following C#/ VB.NET complete code snippet shows how to set trendline for chart series using XlsIO.







  Polynomial trendline with order 3 set to chart series using XlsIO

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