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Deletes the sparkline group.
Use this method to remove the current sparkline group after it has been added to a worksheet range.
void Delete()
Sub Delete()
worksheet.Range["A1:C1"].Value = new object[] {1, 3, 2};
ISparklineGroup group = worksheet.Range["D1"].SparklineGroups.Add(SparkType.Line, "A1:C1");
group.Delete();