How to set gap width to chart series in WinForm Excel?

ExcelEngine excelEngine = new ExcelEngine();
IApplication application = excelEngine.Excel;
 
IWorkbook workbook = application.Workbooks.Open("Sample.xlsx");
IWorksheet worksheet = workbook.Worksheets(0);
 
//The first series in the chart is accessed.
IChartSerie serie = worksheet.Charts(0).Series(0);
 
//Setting the GapWidth to chart series. 
serie.SerieFormat.CommonSerieOptions.GapWidth = 25;
 
//Save the workbook.
workbook.SaveAs("Output.xlsx");
 
//Close the workbook and dispose the engine.
workbook.Close();
excelEngine.Dispose();

Dim excelEngine As ExcelEngine = New ExcelEngine
Dim application As IApplication = excelEngine.Excel
 
Dim workbook As IWorkbook = application.Workbooks.Open("Sample.xlsx")
Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
'The first series in the chart is accessed.
Dim serie As IChartSerie = worksheet.Charts(0).Series(0)
 
'Setting the GapWidth to chart series.
serie.SerieFormat.CommonSerieOptions.GapWidth = 25
 
'Save the workbook.
workbook.SaveAs("Output.xlsx")
 
'Close the workbook and dispose the engine.
workbook.Close()
excelEngine.Dispose()