X++ Code to create and write the Excel File in Dynamics 365 (Excel Export)

/// <summary>
/// Create and Download the Excel file.
/// </summary>

        public void createAndDownloadExcelFile()
        {
            DocuFileSaveResult saveResult = DocuFileSave::promptForSaveLocation("@ApplicationPlatform:OfficeDefaultWorkbookFileName", "xlsx", null, "Testing excel export");
         
            if (saveResult && saveResult.parmAction() != DocuFileSaveAction::Cancel)
            {
                saveResult.parmOpenParameters('web=1');
                saveResult.parmOpenInNewWindow(false);

                System.IO.Stream workbookStream = new System.IO.MemoryStream();
             
             
                System.IO.MemoryStream memoryStream = new System.IO.MemoryStream();

                using (var package = new OfficeOpenXml.ExcelPackage(memoryStream))
                {
                    var worksheets = package.get_Workbook().get_Worksheets();
                    var worksheet = worksheets.Add("First sheet");
                    var cells = worksheet.get_Cells();
                    var cell = cells.get_Item(1,1);
                    cell.set_Value("MyColumnTitle");

                    package.Save();
                }

                memoryStream.Seek(0, System.IO.SeekOrigin::Begin);

                DocuFileSave::processSaveResult(memoryStream, saveResult); // Download the file.
            }
        }