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Gets or sets the chart type of the series.
ChartType ChartType { get; set; }
Property ChartType As ChartType
worksheet.Range["A1:C4"].Value = new object[,] {{"Month", "Sales", "Target"}, {"Jan", 12, 10}, {"Feb", 18, 16}, {"Mar", 15, 14}};
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:C4"]);
ISeries series = chart.SeriesCollection[1];
series.ChartType = ChartType.Line;
ChartType chartType = series.ChartType;