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.
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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