Spreadsheet ssheet = null; ssheet = new SpreadsheetClass(); ssheet.ActiveSheet.Cells[1, 1] = "1,1"; ssheet.ActiveSheet.Cells[1, 2] = "1,2"; ssheet.ActiveSheet.Cells[2, 1] = "2,1"; ssheet.ActiveSheet.Cells[2, 2] = "2,2"; ssheet.Export(@"E: est est.xml", SheetExportActionEnum.ssExportActionNone, SheetExportFormat.ssExportAsAppropriate);