How to export Excel data to CSV file?

using Syncfusion.XlsIO;

Imports Syncfusion.XlsIO

//Initialize ExcelEngine
using (ExcelEngine excelEngine = new ExcelEngine())
{
    //Initialize Application
    IApplication application = excelEngine.Excel;
 
    //Set default version for application
    application.DefaultVersion = ExcelVersion.Xlsx;
 
    //Open a workbook to be export as CSV
    IWorkbook workbook = application.Workbooks.Open(DataPathBase + "ExportData.xlsx");
 
    //Accessing first worksheet in the workbook
    IWorksheet worksheet = workbook.Worksheets[0];
 
    //Save the workbook to csv format
    worksheet.SaveAs("Output.csv", ",");
}

'Initialize ExcelEngine
Using excelEngine As ExcelEngine = New ExcelEngine
 
    'Initialize Application
    Dim application As IApplication = excelEngine.Excel
 
    'Set default version for application
    application.DefaultVersion = ExcelVersion.Xlsx
 
    'Open a workbook to be export as CSV
    Dim workbook As IWorkbook = application.Workbooks.Open((DataPathBase + "ExportData.xlsx"))
 
    'Accessing first worksheet in the workbook
    Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
    'Save the workbook to csv format
    worksheet.SaveAs("Output.csv", ",")
 
End Using