The IChartTrendLines interface contains properties and methods to define parameters for a trend line collection.
| Property name | Brief description | |
| Count | The Count property returns the number of trend lines. | |
| Item | The Item property enables a user to determine settings of a certain trend line. |
| Method name | Brief description | |
| Add | The Add method adds a trendline for the data series. | |
| Clear | The Clear method clears all trend lines from the chart. | |
| Remove | The Remove method removes a trend line based on the specified index. |
See also: