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Gets the data label associated with the trendline.
IDataLabel DataLabel { get; }
ReadOnly Property DataLabel As IDataLabel
worksheet.Range["A1:A4"].Value = new object[] { 10, 20, 30, 40 };
IShape shape = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 360, 220);
shape.Chart.SeriesCollection.Add(worksheet.Range["A1:A4"], RowCol.Columns);
ITrendline trendline = shape.Chart.SeriesCollection[0].Trendlines.Add();
trendline.DisplayEquation = true;
IDataLabel dataLabel = trendline.DataLabel;
dataLabel.Format.Fill.Color.RGB = Color.Red;