C# - I want to convert a csv file to xlsx format on a server

(File.Exists(Util.XLSXFileName))

File.Delete(Util.XLSXFileName);

//Save as xlsx using Spire

Workbook workbook = new Workbook();

Util.CSVFileName, ",", 1, 1);

Worksheet sheet = workbook.Worksheets[0];

"csv to excel";

Util.XLSXFileName, ExcelVersion.Version2010);

//Delete Evaluation Warning using EPPlus

var workbookFileInfo = new FileInfo(Util.XLSXFileName);

using (var excelPackage = new ExcelPackage(workbookFileInfo))

var worksheet = excelPackage.Workbook.Worksheets.SingleOrDefault(x => x.Name == "Evaluation Warning");