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Gets or sets whether the category name is displayed in the data labels for the series.
When this property is true, each data label can display the category
name from the associated chart data.
bool ShowCategoryName { get; set; }
Property ShowCategoryName As Boolean
worksheet.Range["A1:B4"].Value = new object[,] {{"Month", "Sales"}, {"Jan", 12}, {"Feb", 18}, {"Mar", 15}};
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
chart.SeriesCollection.Add(worksheet.Range["A1:B4"]);
ISeries series = chart.SeriesCollection[0];
series.HasDataLabels = true;
IDataLabels dataLabels = series.DataLabels;
dataLabels.ShowCategoryName = true;
bool showCategoryName = dataLabels.ShowCategoryName;