Merge SPREADSHEETML to NUMBERS Online for Free. Free Online SPREADSHEETML to NUMBERS Merger. Merge SPREADSHEETML to Word, Excel, PPTX, PDF, JPG, HTML, ODS, SVG, XPS and more.... Upload your files, call Workbook.Combine method for merging...Cells; var workbook = new Workbook( "Input.xlsx" ); workbook.Combine(new...