Trendlines is a collection of all Trendline objects associated with a data series in a chart. To return a Trendlines collection, use Series.Trendlines .

[DefaultMember("Item")]
 public sealed class Trendlines : System.Collections.Generic.IEnumerable<Trendline>

<DefaultMember("Item")> _
	Public NotInheritable Class Trendlines
		Implements System.Collections.Generic.IEnumerable(Of Trendline)