Excel.Application excelApp = new Excel.Application(); Excel.Workbook workbook = excelApp.Workbooks.Open(@"C:\Path\To\Workbook.xlsx"); // some data manipulation, calculations or visualization workbook.Close(true);
using (SpreadsheetDocument spreadsheetDocument = SpreadsheetDocument.Open("document.xlsx", true)) { // some data manipulation, calculations or visualization spreadsheetDocument.WorkbookPart.Workbook.Close(); }Package library for Excel: Microsoft.Office.Interop.Excel Package library for OpenXML: DocumentFormat.OpenXml.Spreadsheet